JimmyC: Just wondering if your time included any retina optimised apps? There actually aren't that many out as yet. Standard apps will still look the same as iPad2, but I know folks in the US are geeking out about the quality of HD wallpapers they can now apply. It'll come down entirely to source material I'd say.
While the non retina apps still look the same, you will notice how fuzzy the graphics are in them. They are like that in the iPad 1 & 2 anyway, but its more noticeable when you go from a retina app to a non retina app.