Also if you are not concerned about AF, I love my Zeiss 85mm. I frankly don't know if it is sharper, softer or whatever compared to other 85s, nor do I buy into the "mystical quality" of Zeiss lenses that some people seem to attribute to them. All i know is I love my images with that lens, it is built like a tank, easy to use, and it has never let me down.
Samyang (and the various names they are sold under) are optically excellent, but mechanically not as tough as the Zeiss. As long as you know that, try one of them out if you can.
good luck