Do Sigma Lenses Autofocus Accurately on the Canon EOS R?

When the Canon EOS R was announced, many of us were wondering how accurately and consistently Sigma and other third party lenses would autofocus when used on this mirrorless body. As the dust settled on the initial EOS R review tasks, I brought in a Sigma 50mm f/1.4 DG HSM Art Lens to spend some time with. The results from just over 400 AF test images were excellent. The image shared here, a 100% resolution crop, is one from a set of ten and I added all 10 to the autofocus section of the R review, but ... they all look identical. The results from numerous scenarios, including lighting conditions ranging from very low to very bright using AF points from center to corner (80% x 80% coverage for this lens on the adapter), all appeared similarly consistent. While the test results from one lens model does not mean that all lens models will perform identically, this is one of the lenses I've had AF consistency problems with in the past and these results put a very positive outlook on other lens models performing similarly.

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