Think the Sl63 will be naturally aspirated, same as ML63.

I've got an SL500 which the wife mainly drives, pop the abcsport button to reduce the body roll, handles fine, ironically most porsche drivers would be quicker in one of these as it's easier to drive hard.

An Sl500 may only have 90% of the performance of the porsche, 95% of the grip and be a bit slower through a slalom due to the weight transfer, but it's much easier exploit nearly all of its abilities than the porsche.

We had two porkers in a row but picked this over a 997, as it was 90% of the fun, 150% as comfortable, more forgiving particularly in bad weather and more practical too.

997 is the better for the track or the winding alpine road (as long as you know what your doing), but for the other 95% of the time you own the car the SL's a better car to drive and you'll still get 90% of the fun down that alpine road.