The only people that will benefit from the 4k technology is the movie theaters. $k on a TV is a mind game, your eyes can only see so much and a TV is just too small for it to work. Basically, the 4k lets anything over 100" come in clearer. Or a different way to look at it, 4k lets you sit closer to the TV. Some of you probably don't remember the old boob tube TV's, but if you sat to close to them the picture would be very blurry because you could see all of the lines, so the further back you sat the clearer the picture. No days you can sit damn near directly in front of your TV and the picture is still clear.
But, like Clark said, for $799, you have nothing to lose lol. I bought my Samsung 55" UHD in 2013 and it was over $3k............