[murraypaul]

This is a comparison between the iPad 1 and iPad 3 displays, using the PressReader app. This app has not received a 'retina' update, the improvement are purely system-driven, without the app writers having taken any action.
(With all of these comparisons, you can see some improvement at the image zoom the board software defaults to, but you need to zoom in further to get the full measure of the iPad3 improvements.) (Unless you are using a 264ppi display!)