I almost got the x90J in early Dec. in fact I had gone prepared to buy it, when the salesman in his enthusiasm, played a scene from a movie showing a dark background, and there was another Sony 75" OLED right next to it - and the "Black contrast" was startling, on the x90J it showed up a dark purple....and put me off !
I have a SONY 75 9500G and am perfectly happy with the "black contrast" ( I was wary about IR so skipped the OLED in19) I went back for the x90J but sadly, the showroom(s) have revised their prices upwards - and refuse to come even close to the price offered in Nov (1.31) -am waiting for the 22 sets and the consequent fall in last years set prices....
On the other hand I may shift abroad in a few months time, so am really wondering if buying a new TV set now is warranted :/