photozone guys always mentions how he's never seen a really great bokeh from a wide or semi wide lens, esp one with an asph element. it looks like it can be nice sometimes, maybe 8/10 times, but then there are times when it's just a mess. from what i've found though, it doesn't take much of a distance/framing change to really change the OOF rendering with these wider lenses. i guess it's like most things with wide lenses, a few inches here of there, and you have something very different.