Not sure what is wrong with editing on a retina display, but I use the 2012 13" MacBook Air while traveling. Its not retina, but it is light, small, and stays out of the way. I use it for basic photo editing, image downloading, work, and Internet access while out and about. Its small and light enough that I actually want to take it with me. Its powerful enough that its actually quite useful. Photoshop CS6 extended runs like a dream on it. Screen resolution is 1440x900, which was what my old 2008 15" MacBook Pro had. The screen looks beautiful and seems reasonably color accurate. It is a gloss screen. With a little bit of fuss, calibration, color-management, I'm sure it could be used even more accurately.
There are other ultrabook alternatives to consider, but they each had some weakness that I disliked, such as a bad screen, bad keyboard, bad trackpad or something. My profession keeps me stuck with using every OS under the sun, so I'm OS agnostic in that regard.
Review here: http://www.anandtech.com …ir-13inch-mid-2012-review