nice pics my friend.
My input if you care for it at all 
1) has a slightly green tint to it if you want to get technical about correct tones 
2) car too low in the frame= too much distrotion from the wideangle (was it shot with the 16-35 or the 24-70?)
3) AWESOME picture, love how it brings out the body lines. Wish there just a TAD BIT more light on the side of the car, but it works for me as is.
4) like you said, a bit too much fill from the car behind, almost makes the bmw look photoshoped in place (which somepeople love the look of) but what really bothers me if i really break the image down is the fact that the rear window was completely clean and i can tell where the light source is coming from.
5) very nicely done, that most definitely looks like a car-to-car shot, not a rig shot, am i correct?