Strangely enough, this lens is quite usable on the Q. It has no PF to speak of, and takes well to being stopped down.
First off, wide open it behaves like a soft-focus lens. Highlights glow, and the image seems otherworldly. Moreso at 18mm than 55mm, but both exhibit the same glowing effect. The lens is very soft here, obviously. It's still soft when stopped down one click, but really sharpens when stopped down two clicks.
My approximation is that one click is f4.5 at 18mm, and f8 at 55mm. Two clicks is around f6.3 at 18mm and f11 at 55mm. I didn't go beyond two clicks.
At 55mm and two clicks, which is about f11, the photo clearly shows considerably more detail than the f8 shot. Which is surprising, I'd expect diffraction to be hitting hard at f11.
18mm wide open
18mm one click
18mm two clicks
55mm wide open
55mm one click
55mm two clicks
Charles.