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.
In an interview with the Chinese smartphone manufacturer Huawei at Trusted Reviews the primary problem with 4K screens on a cell phone is identified as: “The power consumption would be so huge that your phone would last just half a day”.
While we at 4K rumors are normally in favor of all things 4K, this is the one area where it has not been demonstrated clearly enough that 4K is truly a worthwhile benefit on the relatively small screens of cell phones. The pixel density of 1080p is decently high already, and the 2K displays on phones are getting close to the limits of the eye can distinguish at normal viewing distances.
According to the leaked specifications listed at BGR the HTC M9 will take 4K video.