I currently own the 15-inch rMBP. Picked up and played around with one of the new 13-inch MBA's the other day and I can't shake the increased portability and battery life. Now I'm thinking of trading in my rMBP for a 2013 MBA. I'm just curious about the differences in gaming performance. While the rMBP has the NVIDIA GT650M, I'm wondering if the drastically lower pixel density on the MBA combined with the new Intel HD 5000 GPU will give it comparable gaming performance against the 15-inch rMBP. Has anyone been able to compare the two side-by-side in terms of gaming performance? If the difference isn't that drastic, I'm definitely making the switch.