My new B8 TV is ok. OLED is overrated by many I think. In the store you see a difference but at home it's a minor upgrade to my last 4K LCD TV. Blacks are black yes but I was expecting a night and day pop difference.
Trying to get Alexa to interface to it took about 2 hours! what an over complicated process (2 x LG accounts + 1 amazon account) to get them talking! it's fun to turn the volume up and down, turn the TV off with my voice but the Alexa skill won't turn the TV back on as the TV is not responding lol. mehhhh,
So, when you can compare side by side yes, you see a contrast difference but when you sit and watch a film, get absorbed in it then its only marginally more effective than the previous LCD I had. OLED panning shots are bloody awful mind. Need to mess with that.
The moral here is that I will personally not notice the LCD display difference on the Pimax to OLED HMD's. As long as I can tweak basic panel controls on it through PiTool.
Oh, and the best difference on the new TV is the size, it is much bigger than my last set and that does make a very nice difference so will keep it.