The Sony Xperia Z5 Premium is Sony’s latest “premium” smartphone and also world’s first smartphone with a 4K display. This is definitely world’s first attempt at 4K display and certainly an interesting device.
Inside this beastly device is a 5.5-inch 4K display, Snapdragon 810 processor, 3 gigs of RAM, 32GB of internal storage, microSD card slot, and a nanoSIM slot. The Xperia Z5 Premium is also fully water-proof with IP68 rating meaning you can dunk it in up to about 3 meters of water for 30 minutes like all Xperia Z-series phones.
Now, probably one of the biggest flaws of this 4K device is that it actually runs 1080P most of the time (presumably to save battery life) and the only time it runs in 4K mode is with video playback. 4K mode is NOT supported on anything else like YouTube app or any other apps. If Sony could have supported 4K for video apps like YouTube, it would have made more sense but the way it is, you can only enjoy 4K for video files already on your phone.
Performance is excellent on the Z5 with the Qualcomm 810 processor, I haven’t had any issues other than the fact that it still hasn’t been upgraded to Android 6.0 Marshmallow. I prefer the 810 over the 808 and especially for games/graphic intensive apps, the 810 really shines over the 808. Software UI isn’t my favorite but Sony Xperia UI runs solid with no lags and you can always switch the launcher to a 3rd party launcher like Nova launcher.
With a 3430mAh battery, battery life is unrealistically long for this size phone and the 1080P mode definitely helps. I’ve been able to go full day and a half on most days and roughly the Z5 Premium gets 30-50% more battery life than my Galaxy Note 5 (which has a 1440P display). That could be why Sony opted to go with 1080P but I still feel like I would rather have 4K than better battery life. If you are looking for long battery life though, this is one of the best out there for that.
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