I received a brand new mini with retina display yesterday. I'm very much impressed with it in terms of performance and feel. The text is razor sharp and although things are smaller compared to the regular ipad, I have no problems reading the text because it's just that sharp. The color gamut is noticeable when making direct comparisons, but not as severe as I had imagined and not really an issue in actual use.
But...
It's going back to Apple because it seems they're having serious quality control issues at the moment. Half the screen is pristine white, the other half looks dirty with a yellow tint. Unfortunately, this seems to be a widespread issue and is affecting the Air as well. Some people have gone through multiple exchanges with no luck. In short, buying one means entering the screen lottery. You might get lucky and get a good one on your first try or you might end up with one that looks like it was partially immersed in pee.
Ugh...
Such a shame. It's a nice, if overpriced, tablet.