This lens is crystal clear and the focus and T stop rings are buttery smooth. It performs exceptionally in low light and adds a beautiful cinematic sharpness to my documentary and branded content videos. I got rid of my more expensive Zeiss lenses when I found the Rokinon Cine line. Rokinon has maybe 95 percent of the optical performance of Zeiss in terms of edge sharpness, but that extra five percent on the Zeiss lenses made my subjects look hyper-realistic and a little ugly. The Rokinon Cine line is pound for pound the best lens in the business.