I doubt it would be either at f/22. But, it definitely will render differently, and I'd wager it would be sharper at near max apertures.

It's not a magic bullet, but it is a tool, and one that is different than other tools. Personally mine didn't cost anymore than a typical APO Plasmat, and it came cammed to my Linhof, so, I got a deal. My rule has always been to buy cool stuff that I find under market value, and actually test it out. Sell back what I don't want.