A pro decides what is a pro tool for the job. Steve McCurry used an FM2 for the Afghan Girl photo for National Geographics and he's as pro as a photographer gets thereby making the FM2 a pro tool. The FM3A is a continuation of the FM2 and would therefore also be a pro camera.
Agree. N90s/F90x was used professionally by many during the mid/late 90s as a lightweight(and faster)alternative to the ponderous F4.