My 55" Hitachi Director Series of 15 years died a week ago Saturday. I really wanted the 77" inch A9G but I could not justify the additional cost so I bought the 65" and it arrived last Thursday. I think the thing that floored me the most about the picture quality is the Youtube videos in 4k (and 8k). I really notice the difference in picture quality when I go back to watching FIOS in HD from the 4k videos on YouTube and the Ultra 4k discs. I used Dnice's settings (for the most part) as a starting point, but realize he has the 77" model. It is still a bit dark on some discs (Gladiator 4k), and I did not look at the settings with Dolby Vision or HDR to determine what I need to do to brighten up the picture a bit. I will get it calibrated around the holidays.
Marantz AV7704, Rotel RMB 1585, RB1070, System Audio SA1750, AV720, SA705, SA505, OPPO UDP 205, SVSPB4000, Sony XBR A9G