You can check out the comparisions article at 2012 BMW X5 M vs. Jeep Grand Cherokee SRT8, Mercedes-Benz ML63 AMG, Porsche Cayenne Turbo Comparison Test - Review - Car and Driver
Gallery:
2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG
2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG
2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG
2012 Porsche Cayenne Turbo and Mercedes-Benz ML63 AMG
Gallery:

2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG

2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG

2012 Porsche Cayenne Turbo, BMW X5 M, Jeep Grand Cherokee SRT8, and Mercedes-Benz ML63 AMG

2012 Porsche Cayenne Turbo and Mercedes-Benz ML63 AMG