The new C-class looks nice but thats about it. It's vastly improved from the previous generation car but I know it's not going to compete with the 3-series, A4, or G35 in terms of handling dynamics.
There is one REALLY cool aerodynamic feature on the new C-class:
"The taillights help with the aerodynamics eliminating the need for a spoiler. Both rear lights of the new C-Class have several small air vents. Air is sucked in from under the car and flows behind the rear lights, which are sealed against the body. The air is conducted to the air vents in the lights, where it flows out and influences the airstream along the side walls. This eliminates turbulence which would otherwise negatively influence the air resistance, rear axle lift and yaw characteristics of the W204 2007 Mercedes Benz C-Class."
The vents can be seen in this pic.