[Stephen]

You you can watch a 4K phone screen displayed in SD? lol.

There are videos of hands on with the phone online already though

http://www.engadget.com/2015/09/02/s...ands-on-video/

http://www.sonymobile.com/global-en/...ia-z5-premium/

http://www.techradar.com/reviews/pho...1303153/review

As much as I love my gadgets I do not think there is a need for 4K on a phone. The current phones from Samsung and LG have essentially 2K screens or QHD and they look good enough.