As someone who has returned/exchanged a fat stack of full size iPads over the years due to display issues (uneven color and color casts), I'm happy to report that the rMini I have, like last year's model, is free from overly distracting color shifts across the screen.
I do detect a slight warmth on the bottom half, but it's far less noticeable or bothersome, because my eyes don't scan the screen from bottom to top; they generally move left to right, which is why the Air has caused me such grief with its left>right color shift.
As for gamut, yes it's narrower than the Air. On paper, this is an affront! The nerve of Apple to release such a garbage screen and sell it as identical to the Air!
In practice, it looks great. A little less saturated. A little less poppy. But also a little less eye searing. I've always thought OLED screens were way over the top and looked ridiculous...the Air is bordering on an OLED look. The rMini is quieter in its presentation.
At the end of the day, it's a great display. Once you get over the fact that Apple isn't being all that forthright about calling the Air and Mini "the same", and stop holding them up side by side, you quickly get used to the coloration of the rMini, and it looks fine.
I love food analogies. I think of the Air as a large pizza, and the rMini as a personal pizza. Despite having the exact same ingredients, a large pizza will ALWAYS taste different than a personal pizza. It's all in how the ingredients play together in the oven. Moisture, surface area, weight, etc. all factor in to how a pizza tastes and feels in your mouth.
This is not to say both pizzas won't be tasty. But they will be different, no matter what, despite assurances from a misinformed waiter that they are identical. Some folks want a bigger pie, some want a smaller one. But getting upset that a small pie doesn't taste exactly like a large pie is futile.
