Taken from german car magazine Autobild Sportscars.
They compared the Audi Q7 V12, the BMW X5 M, the Mercedes ML63 AMG, the Porsche Cayenne Turbo S and the Range Rover Sport Supercharged.


Audi BMW Mercedes Porsche Range Rover
0- 50 kph 1,9 s 1,7 s 2,1 s 1,8 s 2,0 s
0-100 kph 5,4 s 4,5 s 5,2 s 4,7 s 5,4 s
0-160 kph 12,8 s 10,3 s 11,8 s 10,6 s 12,2 s
0-200 kph 20,5 s 16,4 s 18,8 s 17,0 s 19,9 s
Quartermile 13,6 s 12,82 s 13,43 s 12,97 s 13,72 s

High Speed
Braking 200 kph to 0 kph
Best: BMW and Mercedes with aprox. 153 m
Good: Porsche with 158 m (PCCB)
Bad: Range Rover with 176 meter

Track test (asphalt VERY cold at 4°C, length 3.67 km)
Winner: Cayenne Turbo S 1:44,46
Second: BMW X5 M 1:46,92
Last: Audi Q7 1:51,23
For comparison: BMW M5 1:43,77 (warmer conditions !)

Conclusion
First place: Cayenne Turbo S
Second place: BMW X5 M
Last place: Audi Q7 V12

Verdict
Cayenne Turbo S still the best handling SUV out there
BMW X5 M automatic tranny as fast as DKG (DCT), impressive
Audi Q7 V12 feels a bit powerless in the low rev range
Mercedes ML 63 AMG needs higher rev figures to be fast
Range Rover Sport Supercharged steering is horrible