@Steve Davies 3 - Quad HD & 4K videos
Quad HD != 4K. Quad HD is 2560x1440, 4K is 3840x2160 (well technically 4K is 4096x2160 and UHD is 3840x2160, but everyone calls the latter 4K)
Not that you can tell the difference when watching a 4K video on a 6" screen, but then you probably couldn't tell the difference between Quad HD and full HD (1920x1080) when watching said 4K video on a 6" screen either. Or watching the same video in "mere" full HD resolution. I suppose those who are very nearsighted might like it though - you get the same experience as having a massive $10,000 TV in your living room by holding your phone three inches from your nose!
I agree with you though, it is essentially a marketing exercise. No doubt we'll see 4K displays on phones eventually. I don't think it is the display technology holding them back, it is the additional load it puts on the GPU for something the user can't see.
Biting the hand that feeds IT
