it's got some stiff competition.... the 85L does 1.2, and the 85 1.8 is extremely fast to focus with fairly good IQ. It'll be like the current sigma 85, or a little higher for the art features. It's not touching the 85L, regardless of how sharp it is.
There's also the Rokinon 85mm which performs pretty much just as well for $250 
I wouldn't be surprised if this new Art 85mm is the same optical formula as their current one with a bit more refinement and the new barrel design/dock implementation, much like their 30mm Art.
But then I am also looking forward to the 85mm art even though I have 85L.
