C200 will/may/should offer a 1gbs codec in an exceptionally small package. That is appealing to some, especially if you add world beating AF.
They are all tools, and finding the right one for the job is the thing.
It happens that I think raw, small package, canon colour AF are very strong in some sectors and you would rent that more than a 55/raw package..
Of course all tools.. blah blah .. but given a choice between the two.. F55 or C200 for the same price.. would you really buy the C200... I mean come on