coming from a Z, into a 330 with sport package, i notice a difference in the torque and h/p but it's also due to moving from a 6MT to an AUTO/steptronic (wanted MT but found a deal that i couldn't pass up on). The 330 is my first AUTO that I've ever owned and it's taking some getting used to. In fact, been talking with the dealer and tracking when DINAN is coming to town to see if I can get "hooked up" with some minor things like software upgrade and such.
anyway, while the 330 with PP might hang relatively well with the Z in straight line, i don't think it would in the curves. the car, while a little on the heavy side, really handles well. i ran with a guy in an M3 out on the Natchez Trace (very windy road over here in Nashville with virtually no traffic..) and he noted that it took all he had just to keep up at a pace of about 5 car lengths behind.
like was mentioned earlier, they are very different cars. the Z's more of a "toy" while the 330 is a well blended combination of performance and practicality. I love my 330, but only simply enjoyed the Z.