Work has just bought me a Retina MacBook Pro 13". I have my own 2013 MacBook Air 11". I was so excited, but what a letdown!
First, to be clear, I am not a power user. That said, I am just like very many people. I use Office, Email, Internet, iTunes and not much more.
So, why is my MBA so much better from my point of view? Well, it is lighter, thinner and seems just as fast. It is also cheaper. Frankly, I can hardly tell the difference between the screens, and to run the MPB at retina resolution, everything has to be "large". As soon as I change it to get everything smaller to get more on the screen, it is no longer "retina" anyway. At retina resolution, I see less than I see on my 11" screen at the resolution I run it at. Oh, and let us not forget that the MBA battery life us superior.
I realise it is horses for courses, but for me, it is MBA all the way. My new shiny MBP is just a chunky heap alongside the MBA. What I bought my MBA, I always wondered if I should have coughed up a bit more, and gone for the MBP, but now I know I made exactly the right decision.