I bought this lens off Ebay but I'm so impressed I wanted to share it. I use it on Canon 6D with the latest firmware 1.06. I had to do a pretty significant +12 MFA, but now it focuses quickly and accurately. The image it creates is great, I'm enjoying it much more than I expected. In the past I've owned most Canon prime lenses, including the EF 50 f/1.2 and f/1.4, and photographed over 100 weddings. with them in my past career. In my experience, even with the best gear, getting a good focus on 1.4 is a challenge, especially on humans. For me it is just as difficult to get good focus with this lens as it is with Canon lenses. It hits hard and looks incredible when it happens. It's sometimes absent at very low apertures, especially with AI Servo with a moving subject (yes). In my experience this is normal. I recently updated the firmware and focusing is noticeably faster and possibly more accurate. I've never had a lens to update the firmware on, that was pretty sweet. To do this you need to be able to copy/paste on the terminal, but that's not too bad. Subjectively, the quality of sharpness and bokeh is excellent. Better than the EF 50 f/1.4 in my opinion. All in all, for $160, I can't believe it's legit. I look forward to what else they do!
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