The other day we were calling a family member on FaceTime using an LCD iPad and then switched to my OLED iPad after the battery died on the LCD iPad. Even though it was just a FaceTime call it was noticeable to me but maybe to the casual observer it's not. I'm surprised at the number of people I know IRL that can't immediately tell the difference between ProMotion and 60Hz which is a bigger deal than OLED in my opinion.
For all forms of media, including SDR content, the tandem OLED is wonderful. It's easily the best display I've ever used. I can't wait for the MacBook Pros to get this tech in a few years, it's my biggest want for the MBP line.
I will say it's not just the obvious benefits of OLED (color and contrast), it's also the M4 chip and significantly better pixel response times that nobody seems to rave about. The beautiful display is accentuated by the fact that every app I use is BUTTER smooth with zero lag. The best demonstration of this is panning and zooming around Maps, it's dare I say magical how smooth the experience is. In fact the pixel response times are probably more noticeable than the color and contrast in my opinion.
Quinn Nelson said it best: the M4 iPad is the fastest feeling computer I've ever used. Yes I get stuff done faster on my Mac but the iPad feels faster.