After a few days of having my mini retina I have to say I love it. It was a bit of an impulse buy with my network cold calling me about having one on contract (they offered me an ipad 4 about 6 months ago and I always regretted turning it down)
I have to say, my ipad 2 still looks great against it. Not as fast and not as sharp but still really good.
My ipad 2 is wifi only and because I know public wifi can be really hit and miss from using my it on my phone, half the time I have to disable it, and because it's a bit heavy/bulky, I've taken it out about 5 times in almost 2 years

the last thing I would want to do is have a full sized wifi ipad to look after in a place that I find the wifi is unusable.
My mini is 4G so it suddenly feels very portable with the size and the 4G. I even took it to the pub

it fitted in my coat pocket.
Oh and about the screen colours. I thought I was of the mind that almost everything has a great screen now but the colours do look quite pale, especially the reds. Maybe this is something that could be tweaked slightly with firmware? Having a very saturated Galaxy S3 probably makes it look worse.