Sony’s New 4K Phone: 4K Misplaced?

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Sony’s new Xperia Z5 Premium features a 4K 5.5′ display which works out to 806PPI  (which is double of the iPhone 6 Plus’s 401PPI).  It also features a Snapdragon 810 processor, 32 GB of storage, 3 GB of ram and a nicely sized 3430 mAH battery.

The relevant questions are is this much resolution noticeable and of benefit on such a small screen and how much will it effect battery life? These questions will remain hotly debated until it gets into enough reviewer’s hands.