No reflection on the merits of the RS4; it's a great car. But to compare the RS4 to the M5, 911 or Maserati coupe is a bit of a stretch, IMO. Also, to compare the perf stats of the RS4 to the old M3 (with its six cylinders) and the MB with the 55 AMG engine is disingenuous. These two vehicles are last generation technology. A more relevant test will be in the near future when the new V8 powered M3 comes out along with the MB with the new 63 AMG engine. This will be a the better and fairer comparison which may yield different results.