i have a sharp aquos. its technically a 3k tv as it has 3 sub-pixels. it up scales to 3k. the blacks aren't close to my Samsung plasma. but i think the worst is the glare. i can't get my room dark enough to counter act it. i decided against 4k because there isn't enough content out yet and there isn't a standard format yet. so that means in a few years your 4k tv may not be compatible with the latest 4k movies/games, ect. i still miss my plasma.