I owned this set for 2 weeks. Black levels were a deal breaker for me, everything looked washed out all the time, especially dark scenes. I watched The Witch with subtitles, and every time text came up on the screen, the already gray black levels were obliterated, lighting up the whole panel, very poor.
I went with the ks8000 to replace it and it destroys the 850d, no contest.
Ive basically been warning people about the 850d whenever I can, as Best Buy seems to really push it, claiming it to be better than the KS8000 and the Vizio P. Avoid the hassle of a return and go for something better