Canon 19mm 3.5R FL Mount

Hi folks, I recently was given several Canon FL lenses and a matching Canon Pellix (which I am getting a real kick out of using). I am curious about the 19mm that I acquired. Has anyboy had any experience or comments about this lens? I find that it's somewaht soft in contrast but makes up for it by giving a very different perspective, almost semi-fisheye in it's distortion, Any other users out there?

I had one and with viewfinder, it's worth about $600. With a Canon "B" Adapter, it will go onto any M39 rangefinder. With a Leica adapter, it will go onto the M-series Leicas. I loved mine, and found it very comparable to the 21mm F3,5 Leitz Super Angulon.