Vegas, I was at Costco yesterday just to see what they were selling in terms of 4K. I was curious to see how 'mainstream' 4K is getting.
The only 4K unit they had was a 55" Samsung, 8500. I always carry a 4K project I shot on a USB thumb drive, just in case I want to pop it into one of the UHD TVs I'm looking at.
The picture was very nice, it really was, but I really felt that every Sony I had plugged this same USB drive into was better. I even went into the advanced settings to try an eyeball of the RGB settings. No matter what I did, I couldn't get the color looking as natural as the Sony. I'm sure an ISF calibration would fix that, but I still find it disconcerting that something just didn't seem right.