2 out of 10 points and not recommendedSmall, light, fast focusingVery unsharp related to the chosen shutterspeed
The bad copies of this lens are useless.reviewed February 25th, 2012 (purchased for $350)
Using shutter speeds between about 1/30 sec. and 1/300 sec. the lens is extremely soft at all f.l. and apertures.
A lot of copies of this lens have this problem.
It doesn´t matter if IS is on or off, and mounted on an Oly. body the problem is the same. (I also bought the Pana. 20mm 1.7. This lens is very sharp.)
I bought my X 14-42 PZ one week ago as a kit with Panasonic GX1, so the sharpness problem isn´t a problem only related to the first shipments.
Panasonic will not answer any questions about this lens.
I hope they are able- and willing to solve the problem.