Options are pretty limited in the 75+ class with HDR.
Before buying the LG UH8500, I narrowed mine down to:
1) LG 75UH8500 - $3,000 - Good off axis viewing, good in bright rooms, very good upscaling, 3D, weakest in dark rooms, decent input lag
2) Sony XBR 75X850D - $3,300 - Good off axis, better black levels, brighter output, excellent upscaling, horrible input lag (deal breaker)
3) Vizio P75-C1 - $3,600 - Excellent picture, great black levels, very bright, decent input lag, narrow field of view, weak upscaling, issues with Xbox One & HDR (should be updated)
4) Vizio M80-D3 - $3,800 - Biggest screen, Very Good picture, Weak upscaling, Not truly capable of HDR - not enough brightness.
My dream set would be an 85" OLED, but it will be a long time before I can afford one of those.