I didn't have much time with it yet, but it feels very solid. I took a few shots to make sure there are no defects with the lens. This lens replaced my EF 85mm 1.8, and since both 85mm and 28-70mm were released in the same years, their focus rings and speed feel pretty similar. I have a 16-35mm f4 which is a newer lens and it certainly has smoother inputs. Overall, Awesome lens and I can't wait to shoot more with it