I've just updated my post above.... here is what I see happening with mine... that's how I would describe it:
Basically the tranny engages LATE (say, .75s) and HARD, rather than EARLY (as soon as you step on the gas) and with some SLIPPAGE for smooth, yet decisive take off.
I will post the link in the evening, since you're taking it in tomorrow. I may have actually posted it in your other thread (from two days ago), so check it out. It has a few folks experimenting with the D and flooring it to their great amazement (and shock), then comparing to their other cars. Be sure to follow the whole threat (named 535 owners do you have a delay when taking off). As I said, there is NO delay in throttle when parked in P. Check it out. Will post the links if you're unable to find the thread.