The M4 feels a lot quicker than the e92 M3 in the game; HOWEVER, it sounds like an angry vacuum cleaner. The e92--while not completely accurate--sounds much meatier, in contrast. I had to buy my M4 in Mineral White, though, so I could have the paint chip to use to make my real-life Mineral White e92!
BTW, nice photos guys! I can never work that thing like that!