Today i am not satisfied with my panasonic 20 1.7 on my E-pl5 ..

It may be an issue with shutter shock as nothing in these images is sharp.

I do not use the 20mm f/1.7 often but this should give you some impression of what to expect. These are with the E-M5 but image quality should be the same. Note that I do use 1/8s anti-shock at all times.

First shot taken at f/4 in good light:

And here is one in really bad light, taken at 1/50s f/2.0:

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Slowly learning to use the Olympus OM-D E-M5.
Public pictures at http://debra.zenfolio.com/.