I think the biggest mistake people make is driving the DCT in S5 and S6. You will break the rear tires loose under acceleration.
S4 is a little slower but its smoother. In the DCT, I can downshift at the apex and upshift under full throttle to exit. The rear will still kick out a tad but its nothing that will cause you to correct or lift.
IMO, the car is slower in S5 and S6.
Kind of like the power button...never really understood that. I've programmed that to off in M Mode.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red