Taken from mbworld.org

"Just received the Feb issue of Motor Trend featuring a german car shoot-out between the E63 AMG, BMW M5 SMG, & Audi S6. Here are the performance figures for the three:

E63 AMG

0-30 1.8
0-40 2.5
0-50 3.3
0-60 4.3
0-70 5.5
0-80 6.8
0-90 8.3
0-100 10.1
1/4 mile 12.7 @113mph

M5 SMG

0-30 1.8
0-40 2.5
0-50 3.8
0-60 4.4
0-70 5.6
0-80 6.9
0-90 8.3
0-100 10.0
1/4 mile 12.7 @114.6mph

S6

0-30 1.6
0-40 2.8
0-50 3.8
0-60 5.1
0-70 6.7
0-80 8.4
0-90 10.2
0-100 12.5
1/4 mile 13.6 @104.4mph

They also tested the 3 at Buttonwillow Raceway Parks East Loop. The M5 was the quckest here.

M5 58.66 seconds
S6 58.76 seconds
E63 60.06 seconds

The writing was pretty weak in my opinion, nothing very insightful. They did mention the smallish size of the tires was holding the E63 back at the track.

Final results-

1. Audi S6
2. BMW M5
3. E63 AMG

Cheers!"