OP:what TV did you get?
I just bought a Sony XBR65X810C at BestBuy and the one I got is defective.
I'm going to return it and look to get a replacement maybe even upgrading to the 850C that has 3D.
Unfortunately it has Android TV, I declined all their terms and conditions and no signing in any of their accounts. It's a little buggy and slow unresponsive to the remote requests, it seems they had released several software updates in the last couple of months.
It does have Amazon, Netflix and YouTube for some 4K content, as well as many other Sony options.
I'm not only using it for AppleTV but also works well in sync with the PS4 and has a good number of inputs and optical audio out to have my old onkyo receiver still rocking.
Nice though I can also access my WD cloud.
Some reviews for your reference:
http://www.rtings.com/tv/reviews/sony/x810c?uxtv=6764
http://www.rtings.com/tv/reviews/sony/x850c?uxtv=6764
In the rtings site you can get nice reviews plus then check in Amazon as well as in BestBuy for comparison the key features: refresh rate and viewing angle, as contrast etc
They have some alternative models as recommendations at the bottom of each review based on the size as any key feature application you are interested like the room ambient and so on.
If I get a replacement that actually doesn't suffer any defect I will recommend any of these, in the mean time be very mindful that the 1080p models out there are almost the same price as a brand new 4K model out there.