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Thank you so much Mark for your reply, but I ONLY shoot in RAW and I am seeing it. I would be more than happy to send you a RAW file to show you. The Sigma firmware was just updated two months ago - still shows it and Tamron says my lens has the latest firmware updated. This is such a frustrating issue, but I definitely see it shooting RAW. I can use the 5Diii and I don't see it.

I have this problem with my 5DIV using my Sigma 50-500mm and Tamron 15-30mm shooting in RAW. It is inconsistent and turning the Peripheral illum corr off does not make any difference.