Here is just a new rendering i made with a Backplate from Malte Bartjen. I made the Car a little bit brighter compared to the Background to let it pop out and the shadow was a compositing decision of me. The Hard shadow fits better to the sharp lines of the M3 GTS than a softshadow which would be more realistic according to the light in the Background.
The rendering is complete made with Cinema 4d and V-Ray. The postwork and color correction was made in Photoshop.
I hope you like it and give me some comments!