Welcome to the board, SPDY0001 and maulik. The 0-60 time for the C320 coupe should be about the same as the sedan, 6.9 sec, but could be a tick slower because the coupe is heavier.
I don't know why for certain, but my opinion the increase in weight is because of the reinforcing needed to maintain torsional rigidity due the large openings in the unibody required for the hatch and the panorama roof.
www.mbusa.com lists the coupe as 200lbs lighter than the 320 sedan....still heavier than i expected, but i guess that means the coupe should be a tick faster
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