Design
Even a passing glance at the Z5 is enough to notice it's from the same family as the Z3 and Z2. It keeps the glass front and back, with a metal edge and minimal Sony branding. Still, it shows a few small changes: the rear glass panel is frosted, which I personally prefer over the glossy panel on the previous model.
The metal edging is now flat, rather than rounded, which gives the phone a blocky look and feel. The metal edges also protrude slightly away from the glass back, making the Z5 feel slightly sharp when I held it. Whether this is an intentional move or not, I can't say, but it does give the phone an unrefined feel. At 7.3mm thick, it's a touch chubbier than some of its rivals too.
Another tweak to the new model is the power button on the side. Sony's replaced its almost iconic sticking-out dimple of a button with a long, flat one. It's not just a cosmetic change -- the power button now functions as a fingerprint reader, and it's the first time Sony has included one on its phones.
I find its side position comfortable to use as it's where my thumb naturally sits when I hold it in my right hand. Left-handers among you may consider it less convenient, though. If it's lying flat on a table, however, it's easier to just type in the PIN -- something that's less of an issue with the iPhone's front-mounted fingerprint scanner. It's quick to set up and accurate, rarely failing to recognise my prints.
While I like the stark, minimalist approach Sony takes with its phone design, the Z5 is (as I said) very much a refresh of what we've seen before, rather than a total overhaul. It also doesn't look as luxurious a device as Samsung's curving Galaxy S6 Edge. Personal preference will no doubt come into play a lot here so I recommend going hands on in a shop before making your mind up.
Waterproofing
Sony's website states that the Xperia Z5, like its predecessor, has an IP68 level of waterproofing, which technically states (again, on Sony's own website) that it's submersible in water over 1-metre in depth for 30 minutes. However the fine print on the specific product page for the Z5 says that it should not be submerged in water, unlike the Z3 and Z2 before it which were both advertised as underwater phones.
All the while, Sony has rather downplayed the significance of the waterproofing in its marketing materials for the phone. While the Z2 and Z3 were both shown plunging into water and taking photos of people in swimming pools, the Z5 is shown only in the rain -- not fully underwater.
I asked Sony to clarify and a company rep explained, "The recent changes to guidance we provide to our customers are designed to more clearly illustrate the best ways to protect devices in day-to-day usage. We communicate necessary precautions, and the specific parameters of ingress protection ratings, to help customers to protect their smartphones and tablets in line with the applicable warranty we provide. We have also recently updated our marketing visuals to better advocate sensible usage of our devices." OK, then.
What that means for you is this phone is not for underwater use. Instead, its waterproofing is designed to keep it safe from accidentally spilled drinks and to let you take calls in the rain. It may be able to survive a drop in the toilet, but don't keep dunking it in your pint to show off to your mates in the pub. If underwater photography is your thing, you'll need to look at rugged compact cameras which can survive full submersion in the ocean for extended periods of time.
Display
The Z5's display hasn't really changed much from the older Xperia Z3. At 5.2-inches, it's the same size and it has the same full HD (1,920x1,080-pixel) resolution, giving it the same pixel density. It's sharp, with fine text and clear images. Although the display looks admittedly perfectly crisp, I'd have liked to see a higher resolution panel. Both the Galaxy S6 and LG G4 (both of which can be bought for less than the Z5) have ultra HD screens, so Sony isn't doing much to keep up with its rivals here. It's the Z5 Premium that packs the 4K display, as well as an even higher price tag.
Sony boasts that the display uses much of the same tech it whacks into its TVs -- the meaningless word "Triluminous" features in the Z5's marketing materials -- which is a convoluted way of saying "it looks good." To its credit, it does. Black levels are deep, resulting in rich colours with good contrast. You can tweak the colour and vibrance settings, too, if it gets a bit much.
It's a great screen for flicking through your pictures, gaming or watching Netflix at home, but it's not super-bright making outdoor use a little more difficult. Even under a cloudy Sussex sky, I found the screen to be a bit dim to read, so those of you who are lucky enough to live in perpetually sunny climates might struggle here.
Android software
The Z5 comes with Android 5.1 Lollipop on board, which is the most recent version of Google's software that's currently available. Android 6.0 Marshmallow has recently debuted on Google's new line of Nexus phones, but as the Z5 was launched back in September, I can't expect it to have it on board already.
On its official blog, Sony confirmed that the Z5, along with the Z5 Compact and Z5 Premium, would receive the update to Marshmallow, although it gave no indication as to timings (I've asked Sony to provide more information). Yet, I wouldn't get your hopes up for it arriving any time soon however as Sony previously has been slow to update its phones -- even the flagships -- to the latest Android releases. Don't buy the Z5 if you're desperate to be among the first to play with Marshmallow. I will of course update this review when we hear any information about the Marshmallow upgrade.
One reason Sony takes so long to update its phones is that it heavily customises the Android interface. When a new version of Android comes along, its engineers have to work hard to apply the skin over the software. Plus each version of Android requires a whole new approach.
Sony's skin isn't too bad though, so you shouldn't be in any rush to get rid of it. It looks fairly neat, it's easy to learn, and some features like the ability to quickly arrange app icons in the app tray by most used or alphabetical order are more intuitive than some of its rivals.
There are quite a few pre-loaded apps which clutter things up, but mercifully you can uninstall most of them. I recommend a full clear out of all superfluous apps and home screen widgets before you do anything with your new phone.
Processor performance
The Z5's engine is a Qualcomm 810 octa-core chip, with 3GB of RAM backing it up. It's a potent piece of silicon, but this chip has had issues with overheating in the past. Most notably on Sony's own Xperia Z3+, which I found would regularly force close apps due to increased core temperature.
Whether by tweaking the software or simply by throttling the power of the chip, Sony has kept the 810 under control on the Z5 as I found no problems with the handset overheating. Sure, it gets a touch warm around the top of the phone (where the processor sits), but it didn't become uncomfortably hot like the Z3+ and at no point did apps force close. I received a warning when shooting 4K video that the camera app may close if it warms up too much, but even after five minutes of filming, it was working fine.
It's certainly a powerful chip as the Z5 is very smooth to use. There are no unpleasant delays when swiping around the Android interface, with apps and menus loading quickly. Gaming too is handled with aplomb with both Angry Birds 2 and Grand Theft Auto: San Andreas playing with high frame rates.
It achieved a multi core score of 2,926 on the Geekbench 3 benchmark test, putting it alongside the LG G4 (2,981), although a significant step down from the Samsung Galaxy S6 (4,608). On the 3D Mark Ice Storm: Unlimited graphics test however, the Z5 racked up a score of 26,885, putting it far above the Galaxy S6 (20,778), the LG G4 (18,611) and the Galaxy S6 Edge+ (24,737). The Z5 then is an extremely powerful device, with more than enough juice to tackle anything you'll want to throw at it.
Camera
Sony has given the Z5's camera a load of tweaks to improve it over the Z3. For one, its 1/2.3" size sensor now delivers a whopping 23-megapixel resolution. The resulting images are very large, clocking in at 5,520x4,140-pixels, and in file sizes, with most shots being around 8-10mb per image at full resolution.
The extra resolution give you some flexibility to digitally zoom into a scene or crop into an image after it's been shot, without losing too much detail. The images themselves though are no crisper than on most phones, and actually rather suffer from compression artifacts when viewed up close.
Battery life
Powering the Xperia Z5 is a 2,900mAh battery, which is a touch smaller than the Z3's battery (3,100mAh), although Sony still reckons you can squeeze up to two days from it. That's a big boast, and not one that's particularly realistic.
In our two battery rundown tests, the Z5 lasted 9 hours 36 minutes and 9 hours 49 minutes -- a bit below the Galaxy S6's 12.4 hours and far below the Motorola Moto X Play's 16 hours. Our rundown test is quite brutal however, so day to day battery life will vary depend on how demanding you are of the phone.
Conclusion
The Sony Xperia Z5 isn't a bad phone by any means, it just doesn't do much to stand out anymore. Its blocky design remains too similar to past generations to really generate much excitement, and its display and processor are pretty much unchanged from its predecessor. That Sony no longer lets you take it for a swim means the device also lost the one major feature that consistently set the Z series phones apart from its rivals -- the ability to take underwater photos.
It performs well though, wielding as it does sufficient power for intense gaming, and its camera can take some great shots. It's a decent phone all-round, but it lacks the real wow factor I expect to see on a new flagship. At a time when its main Android rival Samsung has overhauled the design of its flagship with a stunning curving glass and metal design, being simply 'fine' doesn't really cut it. This is the year that Sony needed to pull out all the stops and it just hasn't with the Z5.
I'm looking forward then to the Xperia Z5 Premium. Its larger, 4K display may not be entirely necessary for everyday tasks, but it's at least something to get a bit excited about. If you already have the Xperia Z3, the Z5 does not offer enough to justify an upgrade. I'd certainly recommend waiting to check out the Z5 Premium, but I'd also suggest looking toward the Galaxy S6 Edge or LG's leather G4 -- both of which are available for less than the Z5 and come with a long list of high-end specs.
Want to save even more money? Motorola's Moto X Play features a full HD display, a water-resistant design and a 23-megapixel camera. It runs vanilla Android too, and comes with a much lower £279 price tag. In Australia the phone is a Vodafone exclusive costing AU$5 per month on the AU$40 plan over two years, with a minimum cost of AU$1,080. The X Play does not have launch plans in the US yet, but its price coverts to about $435. While it doesn't have the same raw processing power as the Z5, it's almost half the price.
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