DXO doesn't test for longitudal chromatic abberation, and I wish they did. This makes their reviews seem a bit misleading, showing low "CA" scores for the Sigma 85mm, while in reality, the Otus is a far more usable lens in the real world, due to it being basically free of any fringing of any kind.
I would feel no hesitation using the Otus in every situation, while the Sigma would be a bit cringeworthy, having problems with fringing in many cases.
The Otus is almost a flawless lens in the real world, compared to the Sigma. Once again, I don't know if the Otus is actually worth that amount of money, but I feel it is the better lens, and lenscore.org kind of proves this with the extremely high Otus score.
Supposedly Canon is coming out with an 85mm 1.4L IS, and judging by my 35mm 1.4L II (on a Sony A7RII), it should be one of the best lenses yet, but you never know.