7artisans 35mm f2 corner issues?

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mcantsin Junior Member • Posts: 44
7artisans 35mm f2 corner issues?

7artisans 35mm/f2

Question: Is it a general issue of the 7artisans 35mm/f2 (the full frame, Leica M mount lens as in the picture above) that its corners are extremely unsharp at all apertures?
I had a second-hand copy of the lens as a loaner over the weekend and tested it on a Leica M9 and adapted to a Panasonic S5. On both cameras, the corners were smeared (even with color artefacts) even when stopped down to f5.6 or f8.

Since it was otherwise a quite decent lens and I haven't read about those extreme corner issues in any of the available online reviews, could that have been an issue only of my copy? What are other people's experiences with this lens?

Panasonic Lumix DC-S5
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