jawel, maar bij arstechnica - een link van Pieterr - staat:
Using Apple's own terminology, by default the screen looks like a sharper version of a 1280×800 screen, which means that out of the box you can actually see fewer things at once on the Pro than you can on the Air. OS X includes scaling options that can make the laptop look like it has a 1440×900 or 1680×1050 screen in exchange for small drops in sharpness and graphics performance.