The BMW M5 might have supercar-toppling performance, but it certainly ranks as one of the more subtle supersaloons on the aesthetic scale. The standard 5-series is itself a restrained design ...
Only about 80 pounds separated the E39 M5 from the E60, going from just under 4,000 pounds to just over 4,000 pounds, and that weight was frequently mentioned in reviews of the then-new E60 M5.