I already have the 2013 13" rMBP, but I've recently bought the 11 inch Air (256gb model). I love the size of the 11" MBA and the screen of the 13" rMBP; the MBA screen isn't awful, but it is significantly worse than the retina screen. However, I'm looking for reasons to keep both but can't think of any justification to do so. They are both extremely portable but the MBA is a joy to carry and use. I carry a laptop with me most of the time at work and at the weekend if I go to do some work at the library. Roll on 2015 and the 12-inch rMBA... I have 1 week to take back the MBA, so I'm agonising over what to do.