Both of these cars are turbo 6's, right ? As I understand it, they won't make nearly as much torque at low RPMs as the S62, so they will have the benefit of centrifugal clamping at high revs. The S62 puts out gobs of low-end torque when the only thing clamping the clutch is the basic springs, and they have to be sized with a compromise for pedal effort. Simply put, you must be very careful not to use too much throttle too early or you roast the M5 clutch.