Well, that's a puzzle. The CF lenses have an improved shutter, easier and less painful focusing, and a far more convenient EV interlock between shutter speed and aperture. I always choose CF over C (though I got a 250mm C for a great price).
CF's don't have a self-timer, but one can always use the camera in pre-release mode and there are self-timers available for cable releases. My C lens self-timers work, but only because I exercise them.
The C lenses also have the moving depth-of-field indicators. OK - that's cool.
I think this 1990's C lens would be of interest only to collectors ...or to someone who just has the hots for how they look.