Really a lot of good work for all the team.
The flatout looks like an ad for selling the new Sony bravia and is really nice.
Nice work too for Motor AG (water effect), Flying Dutchman and Gubbkluken (nice shadow render) too.
Glossy style for the RPM seems supernatural.
A problem for some of them is that the car run without pilot.
So, in term of render & real picture and difficulty, my vote come to my team (not only because it is my team...) because it is the only one which have a pilot in a car, reflect of the sky in the windows and shadow of the car in the track.