I just saw Sony's 4K set at my local Fry's and it was absolutely beautiful! Definitely a substantial improvement over the standard 1080p sets.
Now the question is, would I buy one? Hell no! Not until sets are equipped with HDMI 2.0 and a physical media is standardized. But I can't wait to buy one.
No thank you. I don't believe in invisible magic people that live in the clouds