How much more can you really fit on your rMBP display compared to the old resolutions? And, although you may be able to fit more, how manageable is the viewing situation given that material will be displayed smaller? I'm specifically interested in whether a 13 inch rMBP can display a comparable--or even greater--amount of information (internet tabs, word documents, pdf files, citation management application windows, etc.) compared to a classic 15 inch MBP. I want to upgrade from my old 2008 15 inch MBP and as a graduate student am really attracted to the 13 inch rMBP's portability and (if I understand retina correctly) its potential to display more pixels and therefore more windows, information, detail, etc, than my 1400X900 15 incher. Can the 13 inch actually fit more? Or is the larger number of pixels misleading in this respect? I would especially love to see if anyone has side by side screenshots or photos of displays of 13 inch rMBPs and classic 15 inchers, with lots of windows and stuff open. Or if anyone knows where such images are posted online. Thanks!