Edge sharpness of SEL35F18

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AHM
AHM
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Edge sharpness of SEL35F18
3 weeks ago

I took the following picture with the 35mm at F2.5 (yes, I know that is not the ideal aperture for this kind of image, but I didn't have the chance to change aperture):

The center is sharp:

Center crop

But not really away from center:

Left edge crop

Is it an unrealistic expectation that the lens would be sharp edge to edge at F2.5? This is a pretty large aperture, but not wide open. Could the edge unsharpness have been caused by the polarizing filter?

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Sony a6000 Sony E 55-210mm F4.5-6.3 OSS Sony E 16-50mm F3.5-5.6 PZ OSS Sony E 35mm F1.8 OSS Samyang 12mm 1:2.0 NCS CS
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