The ML63 won a race against an RS4 Avant. The RS4-drivers comment on this was: "Oh, so now I'm losing to a jeep, great!!".
On the other hand the ML was very convincing on the motorway, when the M5 I were in set out to catch up with the big Merc. In high speed, the M5 was catching up, but DAMN, I didn't think such a big car was capable of those speeds..
Against the Bentley Continental, the ML was defeated. We were three people in the ML though.