I owned one high-end Plasma set (ZT60). It definitely produced the best picture I had seen up to that point. Superb, really. But as a novice to the technology, it also presented its own headaches.
Horizontal line bleed
Very aggressive ABL
Very much prone to IR
Dithering
Noise
Noticeable input lag
Upgrading to OLED completely pruned some of these issues, and the issues that technology shares with Plasma are far less prevalent (e.g., ABL rears it head in HDR content, but is never a concern with SDR content with screen brightness set around 80-110 nits, IR and burn-in is nigh non-issue by comparison and input lag measurements from the current state-of-the-art are far, far more favorable for gaming purposes). And that's without going into the benefits of OLED with perfect blacks (as opposed to 'incredible', or other superlatives used to describe black levels on Plasma sets), HDR and supplemental conveniences that have continued to develop since Plasmas were culled from the market ('Smart TV' features that are worth a damn). I wouldn't trade the perfect contrast of an OLED display combined with good HDR performance for anything less.