It sounds like an exciting matchup. The Mercedes-Benz SL65 AMG Black Series is so over the top fast and cool that even the Audi R8 stacked up against it is worth considering. It features a carbon-fiber fixed roof, hood, trunk lid, front fenders, and front and rear aprons. With the absence of the traditional retractable hard top, weight is reduced by more than 500 lbs. Taking this all into account, and you're left with a coupe that goes from zero to 60 mph in only 4.2 seconds.
The Audi R8 4.8 does it in 4.4 seconds (the V10 powered 5.2 is only 3.9 seconds). Does this make the Black Series a true supercar? Absolutely. It is truly a remarkable car and unique supercar that combines all of the performance of the Audi R8 and a bit of a grand cruiser style of the Ferrari California.