Just bought it a few days ago along with a "mid-price" -M adapter ...

Focus seems easy on the GF1 unless there is sun, but due to short DOF when used with aperture 1.4 it's not so easy since you have only a few cm when taking a close photo ...

Another Issue/feature is a bit annoying is the fact that the focus to infinite is not really where it should be I mean ring completely closed
I do not know if it is because of the adapter or just normal behavior, but for Infinite focus I have to turn back +-2mm back ?!
This is not nice to take a quick photo from something ...

But,even if I am not an expert at all in quality of lenses, I really like the result with this lens ...

Here how it looks (I've left the front cap because I like it so much )

Miles

Appreciate the insight - I am considering this lens along with the 35mm f1.4.

I have a 12mm f5.6 Voigtlander and the Voigtlander to m43 adapter and don't have the infinity focus problem that you describe

Stephen

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GF1 - 20 1.7 - Various Nikon Glass
Leica CL - 40mm F2

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The adapter is the issue. If it is too thin, the problem is what you report. If it is too thick, though, you cannot focus to infinity at all.

I bought two cheap adapters for Contax/Yashica bayonet mount to m4/3. One focuses right, but a Zeiss Planar 50mm f/1.7 was loose on it, although it held a Yashica 28mm just fine. So I bought a second adapter, which holds the Zeiss lens tightly but is too thin like yours. I just live with it rather than try more adapters or get into shims and such.

I found this brief item helpful:
Manual Focus Lenses :: View topic - how to check infinity focus