4K Resolution TVs

[cruelpupet]

LG and Sony are now selling 84" 4K resolution (3840x2160) TV's, and some manufacturers have squeezed that resolution into a 32" TV

As with the jump from 720 to 1080, most people agreed that the resolution increase wasn't noticeable for tv's in the 32"-37" range. So at what size do we expect that there will be a noticeable difference between 1080 and 4K?

[Napoleon54]

I like to sit no more than 3' away from the screen so that it completely fills my vision. I demand no less because I sit in front of it even while I'm asleep, and since I quit my job to focus on watching TV, that amounts to about 23.5hrs a day if I don't shower. I'm happy for this upgrade but pixels are still a bit noticeable. Please hurry up with the $25k 8k models, thanks.