Well, golly, I'd never even heard of this lens. I'm obviously aware of it's f1.2 bigger brother, but didn't know they also made a f1.7 version. I'm not in the m43 world these days, but portraits is one of the main areas I miss about having had it. Mostly with the Oly 75mm f1.8, but I used the little 45 sometimes too, and this one looks like another contender. The combination of small, unimposing, size with nice optics, narrow ENOUGH depth of field (keep the whole face in focus and blow the background - perfect) and the great face recognition AF that m43 seems to have nailed, is pretty tough to beat, all in all. I love the DF with various lenses in the 85-135 range, but I've never felt it was really BETTER than my m43 gear for this application. Well, if I ever go back in that direction, I'll have a look at this little lens...
-Ray