When the new X5 came out there were numerous people that wished they had gotten comfort rather than sport seats, haven't seen anyrthing lately though. I have comfort seats in my X5 and wouldn't get anything else in a BMW. If you can get both options do it if not get the comfort seats, your in them all the time might as well be comfortable.

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Porsche 996 Turbo (Ruf 550)
Porsche 993 Cab.
Porsche 997 GT3
Audi A8
BMW X5 4.8 White, Black Napa, Sport, Technology, Premium, Prem. Sound, Cold Weather, Rear Climate, Multi-Contour, Sirius, HD Radio, Running Bds., Bamboo