narsuitus
Well-known
I have owned an FM3a (I am an idiot for selling it). Yes they are a bit clunky compared to a Leica M, but these rigs are great street shooters as well as great with telephoto lens.
I have never owned an FM3a, FM, or FE. Since I needed interchangeable viewfinders for shooting through telescopes and microscopes, I used the F, F2, F3, and F4. Compared to my Leica M6, I could never call my F2 "clunky."

Leica M6 & Nikon F2 by Narsuitus, on Flickr