I ve been using sport seats in previous two 5series. Having Comfort (Multicontour) seats for the first time now i am very unhappy and i would exchange them for sport ones in a second if i could. My logic was comfort seats must be better and i did not even bother to test them. Big mistake, despite having so many ways to set them up i was not able to come with comfortable permanent setup for my body till now.
On long rides does not matter how i set them i am having right leg pain, it feels almost like seat is not parallel with gas pedal axis. During fast cornering i have feel like sliding out of the seat. Side bolsters does not help and in addition it seems car does not remember their last position, while sports seats had ability to "encapsulate me".
Perhaps i am weirdo, but this is my experience so far.
Girlfriend, on the other hand, says those are best seats she sat in (does not drive long rides and does not ride fast
). Therefore my recommendation is, definitely test them by ride before buying.