DXOs Lens test results are so useless. They rate it less than the Otus, as they should, however all of the measures they choose to exhibit would otherwise indicate that the new Sigma 50 should be the better lens. Comparatively, it has the same resolution, better transmission, less distortion, and less CA than the Otus. Only in a footnote do you actually learn why DXO rates the Otus higher: It has sharper corners.
Bleh. DXO. Bleh. It's like they just barf up test results and let the chunks & giblets remain where they plop.
I think the world would be well-served if DXO just gave up on lens tests alltogether, nuked their lens tests database, and just stuck with sensor tests. (And furthermore, I think the world would be better served if DXO did away with scalar test "scores"...just as useless as the chunks and giblets that is their lens tests.)