His quality, ability to deal with top class opposition, the way he can completely change the way his team plays. It's nothing against Coleman but Rafael is the better footballer, anyone questioning that needs to find a bus-stop. In saying that, Coleman had a better season last year but so did pretty much every Everton player, that doesn't mean they are better footballers than those at United.
We'll just have to disagree, I guess.
I do agree that it's not true that Rafael has nothing on Coleman though.
I'd give the edge to Coleman as a player right now - I think he leaves his mark on games more, gets forward better (is harder to stop when in full flow), links up better, has better end product, is better at choosing when to go in for the tackle, and has a better low-level.
He also doesn't look like slowing down any time soon.
That's based on him playing the same 19 teams as Rafael on a weekly basis.
But, like you say, he hasn't also been tested at the levels Rafael has (though I don't think Rafael has been anything amazing in Europe), so maybe he'd crumble at a bigger club.