I like your choices of aperture in these images. I tend to shoot cars with smaller apertures ( larger fstops numbers ) and I think I need to change that approach.
So, I went to my smugmug account and searched keywords for "car" or "cars", and find images shot from f2.8 to f16. But many of my images were of single vehicles alone, in the out of doors, not tightly packed close to many other vehicles as they usually are at car shows and expos and other venues. SO it really depends on whether I want the background to be a sharply rendered part of the image, or not. A nice snowy mountain rainge sometimes is a nice backdrop.
At car shows, I think the very shallow DOF of f1.4 or f2.0 can work very well.
But my images of the Cadillacs in the ground at the Cadillac Ranch display, caught outside Amarillo, I chose to shoot at f16, because I wanted them ALL sharpely rendered, with the empty background behind them apparent not blurred.
I think that it ultimately comes down to the intent of the photographer and what they choose to emphasize, and to de-emphasize. In the crowded spaces of car shows, with lots of vehicles and people, crowded closedly together, fast primes sound like an excellent choice.
I need to carry that f1.4 24mm, or 35mm, or 50 prime more often I think. Sometimes a 21mm f1.4 might be interesting for closeup car images.
Or you can grab them with your phone and blur out the background later, and achieve a poorer result with a bit more work. 😧
The woodwork on those cars is truly incredible. Modern epoxy and varnishes really can create lovely woodwork. I love it.