Is there a problem with this Loxia Lens?

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CSMR Contributing Member • Posts: 647
Is there a problem with this Loxia Lens?

I bought a Loxia 50mm f/2 in as-new condition online, and then sold it after testing it a few times, as I preferred to have the wide aperture and DSLR-style wide-open focusing of a Canon f/1.4 (at the cost of less sharpness).

The new buyer says there may be a problem with some coating having come off. Images below. When I saw them I assumed I had forgotten to clean the lens before sending, but the buyer says he tried that and perhaps he is right that there is a coating issue?
Is this a genuine problem and if so what % off the 2nd hand velue would be reasonable?

Thanks!

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