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I have the Rokinon 85/1.4, Contax Carl Zeiss Planar 85/1.4, Canon 85/1.2L II, and Leica Summicron-R 90. The Rokinon has the best bokeh of all, especially with challenging background features, like small bright lights/highlights, or strong and fine structures, like sunlit branches and tall grasses. I almost always shoot the Rokinon, Canon and Leica wide open. I usually shoot the Zeiss stoped down to around f/8, for still life, landscapes and similar photos where very fine detail is required. The Canon is super fantastic wide open (except for the occassional bokeh and fringing problems), and the Leica rendering is often 'best' many people shots and images with lots of saturated colour. Overall, the Rokinon is a fine lens and relatively inexpensive, however, it's only 'best' performance is the beautiful way it handles very challenging bokeh.
Here's some comparison images. The first photo shows the entire image for a series of bokeh tests I did early this year with a 1DsIII, before I got the 85L II. The next two images show bokeh hightlights in the back left region (reflection off a bright surface) and the right-of-centre middle ground (refraction through a glass vase). These regions are identified by red squares on the full image. The lens names are shown in the window titles. All shots are wide open.