www.edmunds.com states:
'03 330i - 225hp, 214tq, 3285 lbs, 0-60 = 6.7 sec
'03 330ci - 225hp, 214tq, 3285 lbs, 0-60 = 5.9 sec
Not sure how that works...
Giving edmunds.com the benefit of the doubt, could be the gearing... In the past the coupe actually weighed a few lbs more than the sedan... At any rate, for the sake of the thread, given the specs in each car it would just depend on the driver's skill (assuming they're both manual transmissions).