Well, had a little run in with a SLS AMG. Nutshell, I wasn't ready and he got the jump on me (wish we had just agreed to run) but it was close. He pulled about a car length off the start but the M5 hung fairly tight. That car put power down way better - launch control? I was in my D1 cruise settings: D3, DSC on, engine sport+.
Speeds got out of hand quickly on a surface street so I let up
I was impressed with how competitive the M was against this car. Anyone else had a true run with an SLS, or SLS black that can comment?