I should clarify that I am in love with my new MacBook Pro. The retina display is amazing!
The best part is the hardware was actually made to work better with Xcode 5.1 compared to my 2010 MacBook. I just ran my first project for my iPhone Application Development class on this new machine. On my old machine the first simulation since closing the program would take around 5 minutes to compile and run. After the first run, it would take around 2 to 3 minutes. With the new computer, it took under a minute to compile and run the application. I feel like I am in developer heaven!