No not really the retina rMBP is only 1/2 a pound heavier, lasts almost as long on battery these days and is actually a bit smaller footprint wise. Once you spec them out to the same RAM etc they are close in price and the retina display, extra thunderbolt port, HDMI, better CPU and GPU is a bargain at an extra $100. Once you start looking at refurbs or deals at best buy and B&H they are almost as cheap as the air.
Hahaha did you even see my sig?! No need to lecture me on the rMBP. I have used mine for a year now. Prior to the 13" rMBP I had a 13" MBA for two years. So, as you can see, I've had first hand experience from using both.
I assume you have owned both machines too then?
First of all, let me tell you, the rMBP has an amazing display. Everything is crystal-clear and it's a joy to read on it. However - and this is a big one - it's not without compromise, the Retina MacBook Pro lags, it lags a lot when browsing through PDFs etc. The lag in Safari has been reduced with OS X updates, but it's not perfect. In day to day use (and I'm not talking video-editing, Final Cut, etc etc) my old MacBook Air felt like the faster machine. Bare in mind, it had 4GB Ram, a lousy GPU and a 1.7GHz CPU. The rMBP I have has 8GB Ram, Iris GPU and the 2.4GHz CPU.
So there's that, the MBA feels quicker. Not only that, but it's also lighter, trust me you do notice the weight. The OP could even go for the 11" model and have an even more portable machine. (0.5kg lighter than 13" rMBP)
Last but not least, it's a lot cheaper. You do realize there are deals to be made on the MBA as well right...? I've seen them go for $799 brand new. I'm sure you can find used ones for $500 in great condition. That's A LOT cheaper than the rMBP and the rMB! I don't get some of you who consider a 12" rMB to be a beater laptop...?! It's $1200 FFS.
So, there you have it. There is no better combination of affordability, portability and performance, than a MBA, if you can live without the Retina-screen.
...and why am I using the rMBP then? Couldn't stand the display of the Air, had been waiting for a rumored Retina Air, but at the time caved in and bought the rMBP. The display is worth the trade off in weight and UI performance for me. But then again, I wasn't looking to save money, and I like to be using new technology, so I was drawn to the Retina-screen.