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| p.1 #4 · Rokinon 85mm vs Zeiss Quick Test |
Thanks for posting the results of your considerable efforts. In my experience on the 5D and 1DsIII, the Rokinon is very similar in terms of sharpness/resolution to the Planar 85/1.4 and the Summicron 90/2. For most subjects, when wide open and at f/4, the older, classics have a slight advantage over the Rokinon. At f/8, they are all excellent in the corners, but the Rokinon lags slightly in the centre. IOW, they're all excellent lenses. On the basis of cost/performance, the Rokinon wins, hands-down.
IMO, the most important distinction is that they have very different characters. I continue to own and use all of them. You might be interested to know that the humble Mamiya C 80/2.8N is consistently sharper than all of them, at the same apertures. Of course, it's not as fast, wide open.
Did you use LiveView with MLU and a shutter release cable, on a tripod? Also, I note that the images seem to be slightly over exposed. It's quite possible that the 100% crops would show considerably more detail, if there was higher contrast [sharpness = resolution + contrast].
IMO, the biggest advantage of the Rokinon is that it has peerless bokeh when wide open. Otherwise, I prefer the Planar for rendering fine detail, or the 'cron for colour and 'separation' at reduced apertures.