Why many third party lens are rated higher for Canon than Nikon?

Started Jul 11, 2013 | Discussions thread
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newfounder
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Why many third party lens are rated higher for Canon than Nikon?
Jul 11, 2013

Is it because the cameras being used affected the image or because the third party lens was compared against the two major brands. I believe for the third party lens along there shouldn't be difference.

e.g.

Sigma 35mm f/1.4 DG HSM reviews at BHphotos

Sigma 50-150mm f/2.8 EX DC OS HSM APO Lens reviews at bhphotos

I believe I had seen more.

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