I've discovered how to do a split-screen video. So, I took a lap from a Cooper S (with some mods - 15% pulley, intake, exhaust) and split screened it with a lap from my Cooper. Not an entirely fair comparison, as I was solo, and the other car had a passenger and was being driven by someone other than the owner (an instructor that also drives a MINI), but it's the best comparison I could find on my computer.
The footage from my car is shot at a wider angle than the footage from the S, so things look a little different. I did mess up the audio a little bit - only the sound from my Cooper present.
http://homepage.mac.com/jtross/CooperVsS.mov