Quote:
Originally Posted by hsbob
the biggest difference in the 850 has the adaptive handling system. look at the 550 series dyamic handling [$3500] pak. it lets the car ride like a lux car but turns like a sports car. i have a 640 conv and the m850 drives circles around the 640, not counting power. the 640 gets 26 mpg and the 850 gets 25.5 on open freeway at 80. for a little difference get the 850
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Back to the original question this is one answer as the 840i even in M Sport does not include Adaptive M Suspension Professional with Active Roll Stabilization nor M Sport brakes plus even more so the carbon core that the M850i shares with the M8. You can also add a CF roof which lowers the overall center of gravity but it will add $3K to the price which I originally balked on in favor of the B&W audio but am glad I ultimately chose both. So it is more than just the amazing N63 engine but to the OPs point is the cost differential worth it?