All plasmas I saw back in the days when they were popular (on stores + one friend had on, at least some were panasonics ) looked kind of weird.
Like the picture weren't still, but constantly "moving / waving / like it would have old crt tv noise" or something like it.
I have 2 plasma TV's (60" Kuro and 65" Panny) from 2009, both calibrated by D-Nice.
Though I have had the upgrade itch for OLED's for many years, I have always found the picture on plasmas to be better, more natural in terms of motion and easier on the eyes.
Yes, the plasmas are heavy, and get hot if running for a few hours and obviously cannot get 4K but seem to have a very satisfying, "liquid" picture, particularly with motion.
Even on the forums, I see many having difficulty with decision to change from plasma to OLEDs, despite plasmas being 8-12 years old technology now!