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Can't say about the Minolta. The Zeiss and the Sigma are both fantastic, though a little different. I wouldn't consider the Sigma to have bokeh much like the Zeiss -- it's very similar to both Nikon 85/1.4s.
Any fast 85 is pretty bulky, especially with an AF adapter. You might be happier with the Samyang and manual focus, which will keep both the cost and weight down. It also has a mechanical aperture, which makes handling better for manual use.
I occasionally use the Sigma 85/1.4 on my NEX (Nikon mt.), but unless I absolutely need the speed, I generally prefer a much smaller lens since it handles so much better. I've been using a late non-AI Nikon 85/1.8 on the NEX, and it's a nicer match. The 85/2 is smaller still, and there are similar options from other manufacturers.
85mm is already on the fairly long side on a crop body, and a 135/1.8 is considerably tighter still. I like a 50mm for a loose portrait lens on NEX, and lately I've been playing around with an ancient Kodak Ektar 63/2 that is really lovely, and closer to the 85-105mm classic zone for portrait lenses.