wekla911, sorry to break the news to ya, but your friends Z4 is going to be about a second faster in the 1/4 mile, than your new Crossfire with an automatic. One second really doesn't sound like much, but believe me, a car that almost breaks into the 13's vs a car that runs 15's will definitely feel faster in a "seat of the pants" comparison.
But don't let that bother you. A 15 sec. car that can run 150+mph, and feel secure while doing so is nothing to be ashamed of.
Besides, your new Crossfire is going to look 10 times better than your friends Z4. Just park both cars next to each other in a busy parking lot, step back, and see which one draws the most attention. If that doesn't make you feel good, then nothing will.
I own a white Crossfire, and I love it. I'm willing to bet that you will love yours too.
Good Luck, and enjoy.