Don't get me wrong the 850 is a great tv with a very nice picture but I noticed when I was looking at it in Best Buy the black levels can be very soft. This is one of the main complaints about the set along with the sound (which I thought was fine). You will be happy with this tv.
You should not be worried. I'd take Sony any day over Samsung. About the only thing I think that Samsung does noticeably better is out of the box sound. The panels are a bit more attractive from the side, but who gives a **** about the side of a TV? Android TV is also world's better than Samsung's Tizen platform. It's no contest, there, at all. The biggest difference is that, in general, Sony is offering much better viewing angles across the spectrum than Samsung. They are pretty even from straight on, though.
To me, the build quality and lack of panel lottery alone are the two "killer" features that Sony has over Samsung. Add in the platform difference and the difference in viewing angels and I think it's a winner.
Ok. thanks.
I'm not worried about the tv sound I have a hard wired surround system in the room already that the new tv will be connected to.