As far as the peak brightness reports on the 2020 LG OLEDs being dimmer, I've measured six sets so far and five measured over 700 nits and only one measured 680, first read 10%, D65 calibrated. The two i have at home are really bright, 740 nits first read. HDR is also very bright so we will have to see as we look at more sets. This includes some 65 inch sets which is good.
Sony 55A1E, A9F, LG CX
Marantz 7012, Ohm Walsh Speakers
Klein K10-A, Jeti 1501, Murideo Six-G Gen2
Calman Ultimate, LightSpace Pro, ISF Level III Certified