I had a rMini, along with my wife, but I did return it for an Air. I'm just a amateur photographer, but if you look at photos of say a blue Iris - or a red Rose on my Air and then on my wife's mini, the difference is not subtle at all. It's strikingly obvious. On the other hand, look at a high definition photo of a white tulip - and the Mini looks as good, if not actually better....
I like the new Mini.....but true colour reproduction is important to me. Everything has it trade offs. If folks can't see a difference, then it matters not! I wouldn't want anyone to feel bad about their new iGadget, and only post to put the point that I'm not sure it's a storm in a tea cup at all. I think Apple should be up front about the difference. A near 40% difference in sRGB on a display marketed as premium is not fair, as far as I'm concerned.....and really, I have many high definition photos where the difference is nothing short of obvious. It mattered enough to me, to the point where I swapped my rMini out.
My wife? Can see the difference - doesn't care less, loves her rMini - so everyone is happy! I think the chap who writes all the reviews here put it very well. Pick what works for you - you can't really lose with either, but be aware of each device's limitations.
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