I've always heard those 3rd partly lenses, particularly Sigma, don't have the AF performance of the native Canon L lenses....is this still true?
I can't speak with the older third party lenses but I heard that was an issue but all the recent Art series and Tamron lenses have match or exceed L lenses for me.
I've paired it with Canon 5D IV and EOS R and it works really well. I've tested Sigma 85 1.4, 135 1.8, 105 1.4, Sigma 14-24 2.8, Tamron 15-30 2.8 IS.
I'm confident enough to replace my Canon 24-70 2.8 II & 70-200 2.8 II IS if they design FF mirrorless lenses.
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