OK...since there was a little more interest in this lens than I expected, I made a little sample presentation here. I don't know what to make of it, honestly. At large apertures, it is only sharp in the very center, then fades to crap everywhere else. First, a couple of shots of it on the K20D. It's kind of cool looking actually--rather handsome head-on.
Here, wide open, it kind of just looks awful:
But when I went outside, awful turned into interesting, in a lo-fi kind of way. It focuses extremely close (good thing) but the focus ring has a ridiculously long throw.
Stopped down, it gets to look more normal, if extremely low contrast, and never all that sharp. The landscape pic, I brought in some blacks. Honestly, it's not the first thing I'd reach for, for regular shooting.
Overall, I don't think it's quite worth the fifty bucks I ponied up for it. But it's interesting as a cheap effect-y lens. If I want that crazy hazy bokeh, I'd rather shoot RF with the Canon 50/1.2 wide open, because it does get very sharp stopped down, whereas this one, eh.