[Klaus]

MFT can also be problematic. Last year I bought a Pana 20/1.7, which was a bit soft on the right side. It was sent back to Panasonic. After almost two months I got a new sample and this one performed better. 

This autumn I bought a Pana 45-150 which was miserable. At the short end the left side was soft and at the long end it was better but absolutely not perfect. I sent it back last week (with sample photos), so now just to wait and see what happens.

 

Göran

 

Yes, I would prefer Olympus here or a non-OIS Panasonic lens.

 

Honestly, I stick to my previous comments that an optical image stabilizer is the cause for most of these problems.

If the manufacturing is already sloppy, things are pretty much doomed to move over the edge in this case.

It took Canon and Nikon years till they reached consistency (thus do yourself a favor and never buy a used IS/VR lens).