Had a "real world" experience with new E60 M5 this evening in my stock 2003 rs6 (13.02 sec 1/4 mile).
I knew the driver of the V10 M5.
I can report that from standing start to 130 kph (75 mph) both very even with very slight edge to the M5.
Out of respect for our licences and other road users, although not many around, did not go much past that speed.
M5 has awesome banshee scream from V10 exhaust. very impressive car. Combined almost 1000hp between two cars is astounding when you think about it.
Given that E60 M5 is state of the art normally aspirated car and RS6 is 2 years old, I am very pleased with the RS6.
I and the