Lensrentals.com has posted a comparison between the EF 85mm f/1.4L IS, EF 85mm f/1.2L and the Sigma 85mm f/1.4 Art. This comparison is not their usual scientific endeavour using OLAF, this is a bit more of a real world comparison by looking at images with our own eyes.
From Lensrentals.com:
The Canon 85mm f1.2L II is the standard and is really middle of the road in this comparison. It’s a great lens with that dreamy bokeh but is the most expensive and is slow to focus. The Canon 85mm f1.4L IS performed amazingly with everything I threw at it. It’s sharper than the 1.2, faster, and has image stabilization but is still pretty expensive. The budget Sigma 85mm f1.4 Art lens is sharp and quick but is really heavy. My new choice to keep in my camera bag for a wedding is definitely going to be the new Canon 85mm f1.4L IS for the image stabilization alone. Read the full comparison
We await full OLAF testing to make sure that the machines agree.