Since the lens is designed for video shooting, it has a more advanced stepping motor for focusing. When photographing, I specially "chased" it under different lightingcomnditions and on different objects. Pointed at the center point, hits right on target. I think you should always buy everything new, improved. Purchase was satisfied as an elephant. Put the previous version of the EF 50mm f/1.8 II lens on the shelf. In terms of price, the more advanced but older f/1.4 modelcomsts twice as much.Color quality, sharpness, bokeh, you can look here: Definitely recommend to buy.