I'm on the fence about it. I've owned every OLED iphone, several OLED TVs, the mini-LED 12.9 M1 and a MBP M3 Max 16"
I'm just not sure how much better the screen can be. OK if you sit side by side you'll notice a bit better contrast or pop (which could be considered over-saturation) on OLED. You'll see bloom in extreme circumstances on mini-LED.
But the blacks are real black on both technologies, and that's the thing most people notice and go wow at.
Timmy said it's the biggest change since the iPad was launched ... I'd say mini-LED was, and OLED is just an evolution of that, to the eye.