75" QD LG TV here, bought on impulse as it was heavily reduced from its original £3k plus price.
My kids love it, wife is happy with it, it's certainly blinding at times with HDR and such.
It seemed to improve over the 1st couple of months after we installed it. Have had it for some time now.
Newer QD TVs may be better now though.
I personally find it a little larger than I would like, despite having used a projector with an 80" screen in the past.
I don't think it handles night scenes well at all in some content, it's as if the backlight processing is struggling or the streaming quality is showing its worst maybe. Some other small quibbles apparently only I see.
It's certainly near Oled black at times, not much halo effect.
Admittedly it can depend on the quality of the streaming service, Apple certainly can be more consistent. Some movies on Netflix are certainly better than others.
It's certainly brighter than the Oleds we looked at, but when it needs replacing, it will most likely be replaced with an Oled, and certainly 65".