This lens is interesting for two things:
The bokeh renders smoothly. If you (one) do (does) not plan to use the lens wide open, not sure why one would consider this particular lens? It is f1.4 for a reason.
So even if there would be some focus shift, one does not have to care about that.
The lens is not SHARP, but it is contrasty. The not tack sharpness should not matter, the contrast and tjhe shallow DOF make things look just fine.
The Canon EF 85mm f1.8 USM is not as contrasty/punchy, and renders less smoothly. It excels in AF speed and it is mall and light in comparison.
So, that is the choice. For wide open shooting and bokeh, the Zeiss is the one to go for. Also as object of beauty. That is, if one can handle big aperture manual focus. I am quite ok with that (but I also use a 6D with Eg-S focus screen, I could even resort to trap focus with ML on the 6D, which is very accurate), but it is personal and depends also on the intended use of the lens (no moving subjects, timing is paramount).
For AF and speed and weight and size, the EF 85mm f1.8 USM can't be beat.
The person should base his/her choice on that.