8 out of 10 points and recommendedweight, sharpnessfield curvature (depends on copy)
Sadly my copy has field curvature at 18mm.reviewed October 20th, 2010 (purchased for $697)
I have to stop down to at least F8 and focus to ~8m instead of infinity. It's acceptable with these settings.
The performance from 9 to 14mm ist very good. Can't complain here.
The lens is really small. Big advantage over WW slr lenses.