With the relatively short drive we had, it was pretty clear that the Sport model has less body roll and felt more comfortable around the twisties. There was no difference on the low speed wet skidpad, and I didn't feel any difference in braking. The most noticeable difference was in the avoidance maneuver, where we are supposed to change lanes out and back in quick succession, through pylons. The Sport model seemed to just cruise through this with apparently lower weight transfer from side to side. The stock model felt more, well, top heavy is the way to describe it. This was a similar feeling to the Jag and Audi, but I like the slightly more solid feel of the steering weight in the 5'er. I didn't get the impression that steering weight is different between stock and Sport.