Maybe the C will manage to outsport the 3, while at the same time maintaining Benz trademark comfort?

lol I doubt it. But they do have the chance of developing a car with an excellent ride/handling compromise, like the SLK, which in many tests has trumped the z4 for this very reason. Most of the dynamic ability of the BMW, with a fair dose of extra comfort and refinement.
Well regardless, its only a year away before we see what they come up with. I'm sure they are gunning for nothing less than the class benchmark as an overall package.