Is there a significant difference between the Macbook Pro Retina Display and the Macbook Air 13" Display let's say the viewing distance is around 25 inches. If you are sitting really close like 10inches away I guess you would see the pixels in the Air. What about the apps on the Retina Display? Are they 4 times smaller if I set the retina display to its max resolution? I mean is my desktop area 4x the size of the Air's?