Jim, nice subjects. I'm conflicted by the title of the post and what I know about your skills as a photographer.
I was under the impression that this thread would show us how great those primes can be.
I'm sorry but I know those primes, in your capable hands can produce much better images.
All the but the last image is out of focus and most of the other shots are over exposed, but they are not in focus.
Take a look at the first one. It has very shallow depth of field, as we would expect, but it's out of focus and there's little depth, the subject is not isolated in the frame rather it blends into the entire scene. . .
The main reasons to shoot primes are subject isolation and image sharpness, which both are almost non existent in your shots, except the final dobi shot. . .
I know you do a lot better than those. Maybe post a couple more.
Thanks,
Tony