The facelifted SL55 with the new engine (517p) has beaten one of best BMW handing cars in a germancarmag.
Auto Zeitung sees the advantage of the M6 in the lower acquisition costs (24.500,-- € ceaper), the larger trunk, the 195 kg higher load capacity, and the existing back seats but SL55 offer better comfort and better brakes. SL55 is faster around their test track (1.5 sec faster than the M6). The M6 suffers from understeering and power-oversteering.
0-100 km/h M6=4,5s : SL55=4,5s
0-200 km/h M6=13,2 s : SL55=13,0s
I always knew the Sl55 was a great handling car but Im shocked

and happy for MB fans that the facelifted SL55 did so well. Now I hope Sportauto test the car one day around their tracks.