Anyways,
@335iVlad, posting the article about the xDrive does bring up a good point even if it has an extra 20 hp over a regular 335i due to the M Performance Package. Even the regular xDrive BMW's list faster 0-60 times than the RWD versions, but I'm pretty sure that's just due to the AWD being able to get more traction at launch. Gearing and engines being the same, I would expect the xDrives to be a hair slower in rolling acceleration due to the extra weight. Another good example on why you should look at more than 0-60 is the 328i. It has a great 0-60 of 5.6 seconds, but it sure can't hang with other 5.6ish second cars like the IS 350 or ATS 3.6. Just look at it's rolling start, 60-100, and 1/4 trap speeds.
@pneks2001 posting about a comparison with the hybrid got it in my head you were considering the hybrid, which is why I went into detail on my own acceleration experience with the car, but looking at your posts it looks like you are considering the 3.7 so it may not be relevant.
Regarding the hybrid, the consensus here for a while has pretty much been that the hybrid is faster than a 335i based off other members' experiences and my own and that wasn't always the case. It changed as more testimony came rolling in from people who were regular quality posters. The comparison comes from the 335i being a gold standard in acceleration for so long back when you didn't have hybrid Infiniti and 3.0tt C class.
Again, this is against the stock 335i. A tuned one will obviously be a different story. It would be interesting to see a comparison though.
Personally, I think the hybrid is a fantastic car to have a little street racing fun in and before anyone chides me on that being illegal, let's get real. We've all probably done it and the Republican candidates have probably all smoked marijuana.
I hope the info is helpful. Again, I somehow started thinking you were considering the hybrid, although it looks like you are going for the 3.7. If you haven't considered the hybrid, though, go give it a test drive.