I'm a little late to the party but that's how it goes sometimes.
I am a very happy QN75Q80R owner. It replaced a 70 inch Sony XBR850 that was suffering some edgelit LED failures that resulted in some severe light bloom across at least 1/3 of the screen. This happened just a month before my extended warranty was due to expire. Whew!
I did my research and, after a 2-week wait, the warranty company sent me a check. Between the amount of that check and some haggling with the store, the warranty payout covered the TV, a new extended warranty, delivery of the Q80R and disposal of the old Sony.
I initially used some of the settings posted here when I setup the TV then tweaked them a bit to suit my specific needs and room environment. I did learn a couple of things along the way:
1. A direct connection between your video source and TV makes for much better picture.
2. With proper setup of your AVR's audio section the digital audio output from the TV works great.
Of course, these are not necessarily AVR specific brand issues but for my McIntosh MX151 pre-amp/processor - which won't process 4K via HDMI
- those configurations work best.
I am a very happy Q80R owner.