Very nice comparo. There is no point in talking about track abilities. Although it is good to get a feel for these cars, they will be driven 99% of the time in the streets. And even with CCB and agressive tyres, these cars do not hold on well to repeated tracking sections, therefore I feel like the street comparison is more relevant. Nevertheless I can't wait until lap times come out. I think it will be pretty close. The E63 S has been said to have better steering feel and more accurate steering, while the M5 feels a little more athletic. I think there will be very little in it.
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