The Sharp UB30 4k LED TV has an impressive contrast ratio and handles itself well in a bright room. Unfortunately, the other aspects of the picture quality aren't as good.
The viewing angle of the Sharp UB30U is limited, and it loses saturation very quickly off-axis. It is even a problem if you are directly in front of the TV, assuming you sit close enough. For example, you can see slight discoloration on the left and right edges in all our pictures in this review.
Update 01/06/2017: We have changed the methodology of testing. Since this is an old TV which we don't have anymore, we extrapolated the results from 2016 TVs.
The input lag of the Sharp UB30U is 79.7 ms, which is very high. You will notice this when playing fast games, so do not buy this TV for gaming.
Note: Sound Quality test for TVs reviewed before 2017 was performed at 75dB, 85dB, and Max SPL. Starting 2017, the target SPL levels have been changed to 70dB, 80dB, and Max dB SPL.
The frequency response isn't too bad for a TV, and it remains consistent even when the TV is pushed hard. However, there's not a lot of bass present and it doesn't get very loud either.