Here are some numbers on the new S6:
0-60: 3.7 seconds
0-100: 9.2
0-130: 16.1
1/4 mile: 12.1 @ 115
http://www.caranddriver.com/reviews/...s6-test-review
The M5 is quicker but not by a huge margin like the last gen S6 vs. last gen M5
Zero to 60 mph: 3.7 sec
Zero to 100 mph: 8.3 sec
¼-mile: 12.0 sec @ 122 mph
http://www.caranddriver.com/reviews/...ad-test-review