I shoot auto photography as a hobby (when I'm not being a computer nerd full time.) The magazine I shoot for has a readership in Texas for 60,000+ and is heavy gloss (almost waxy... really nice quality!)
Here's the current issue, with my shot on the cover..
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If that doens't work, it's here
http://www.golilm.com/images/AdamsCover.jpg
Anyways, one thing I've learned with shooting static autos (and your shots there are very nice considering your equipment!) is to use small apertures for very crisp shots. Shoot from a tripod whenever you can, and use MLU if you have the chance. I shot the above cover shot with my 10-22! So as you can imagine, that C6 Z06 was VERY close. I was laying on my stomach in the back of an Infiniti G35 Coupe shooting from the trunk on a racetrack.
If you can, upgrade to the 50mm 1.4. I had both for a while, but there's just something about the 1.4 that's nicer. The images just 'pop' a little better. 85mm will be too long most of the time. Get a the Canon L 24-70 if you can swing it, if not get a sharp Tamoron 28-75 2.8. For track days or moving shots, the 100-400L is hard to beat (or the Sigma 120-300 if you want to drop some bucks and work on those biceps!)
Good luck and most of all just have fun with it!