At f/9, my 305 G-Claron does not have a particularly wide aperture at all. It also is not at its sharpest wide-open, but if that's due to cell spacing or to lens aberrations characteristic of the lens design, I have no idea. I do know that at f/16, it becomes very sharp.
I once used it wide-open on my 4x5 to photograph distant fireworks. Focused at infinity, it was able to resolve the fireworks adequately for a nice 11x14-inch print. I can think of no other time I've used it at f/9.