Could really do with some reviews on this TV.
I am seriously considering returning my Sony 55X9005 for this set. It's a little cheaper, bigger screen and the input lag is awesome for my new X1.
I'm just worried that the PQ and viewing angles won't be quite as good as the X9.
The sets should be very similar other than the larger 65" screen on the 65w850a. Both TVs should have the same PQ including side lit LED viewing angles. Both TV's include the Triluminos display other than the 9005 being a 4K set. I understand you can only see the difference between the 4K set vx the 1080 set if your two feet or less away from the viewing screen.
Here are the viewing angles for the 850a US model and the 855a UK model which are the same set. I could not find the viewing angle for your 9005 TV.
Viewing Angle (Right/Left)
Viewing Angle (Up/Down)