Just curious if people have experience with the 12" MacBook with Retina display for photo editing. My primary machine for editing is a 21" iMac. But, I'm considering adding either a 12" MacBook or 13" MacBook Air. I would do occasional raw file processing using Lightroom. I prefer the processor in the MacBook Air, but I really want the Retina display in the MacBook. Are folks doing photo editing on MacBook successfully? I know the MacBook Pro, either 13" or 15" would be better all the way around, but I'm looking at the MacBook and MacBook Air due to the portability. Any input would be appreciated. Thanks.