Blackmagic make video cameras for a specific niche and they're great (I want one myself). But most of their customers buy into the Micro 4/3 mount system. PL mount type cine lenses have never had autofocus and likely never will. The job of the focus puller is not just to keep things in focus but to adjust in harmony with the mood and pace of the scene. There are separate remote lens control systems for when a camera is mounted on a gantry and so on. Framing and focus are treated as distinct jobs on a large set.
