I agree, i was shocked by how small a 77 looks with an 82 sitting beside it...I’m in a shockingly similar situation to you and have been having a hard time deciding. C9 is a phenomenal tv but reflections maybe the one problem for you. In a big space a big tv has a ton of merit on size alone. Ideally a 82-85” would fit your situation the best. The new 85” Samsung Q 9500 looks very promising if you can wait a few more months. If they made a somewhat affordable 85” OLED I would have already bought one but size has been my big holdup there.
Im not finding anything on the q9500 with google... where did you read about it?