Please tell me the screen comments aren't suggesting that the 13" MBPs are better.
In terms of panel quality, the MacBook Pro displays are better. If you look at a MBP display, no matter which model, and then directly back at the Air, you'll be able to distinguish a difference in color accuracy and viewing angle.
However, I personally wouldn't sacrifice the lower resolution / slightly better display of the 13" MBP over the higher DPI in the 13" Air. It should only really matter to those who, for whatever reason, are deciding on a hi-res 15" / 17" MacBook Pro instead which have a similar DPI value as the Air.
In other words, IF the 13" MacBook Pro had a 1440 by 900 resolution, I'd recommend that over the MacBook Air to those looking specifically for the best quality display.