Here is an interesting comparison test that is not done very often, and especially not to this scale. German finest car magazine - Autobild, has tested 100 cars in just one category. They wanted to see what car is best from 0 to 100 to 0. They published their findings in their magazine, but have also made a pdf file available for us.
The SLR scored 4th place, right after the Gallardo and the two Porsches. It was a very good performance by the SLR, going from 0-100 km/h in just 3.9 seconds, which is the 3rd fastest time, but did lose some time due to braking. Its ceramic brakes are designed more for track racing than for this event where regular brakes would have done a better job.
Here are the Top 5
Porsche 911 Turbo
Porsche Carrera GT
Mercedes SLR McLaren
Ferrari F430 F1
Click on the Images below to see the rest
Here are the best in each category Videos