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If you compare the cockpit to , say the Mercedes-Benz E63 or CLS63 AMG then you will see that the M5 is sparse in comparison in regards to switchgear. Whereas the AMG is like getting behind the wheel of a commercial airliner.

But the sparse M5 interior is to air it's simplicity as a business car that at the touch of the M button transforms into a high performance sport car.
When you see the M5 it's intentions are not entirely clear until you get behind the wheel. It is deliberately understated.

When you see the equivalent AMG you know it's intentions immediately as AMG has a touch of the theatrical in it's execution.

But thats what makes an AMG and thats what makes an M5 - One sets out to be loud and in your face and the M5 just sums up the well known phrase - "It's always the quiet ones"