In a back room at its stand, Sony had two units on display next to each other. During a demonstration, Sony displayed 4K content on one and upconverted 1080p content on the other, and the results were barely distinguishable.

The best result will come when upconverting content that was originally mastered in 4K, while results won't be as good for sports broadcasts, a Sony spokesman said.

The last challenge is that to see the difference between 1080p and 4K you need a big screen. How big depends on who you ask, but Sony's TV is 84 inches, which won't be a good fit for everyone.