The AF speed has increased, the Sony a7Riii has become tenacious it will not let go of a face. AF has become much smoother, before you would get a shimmering If you have turned off face detect, obj tracking and touch spot focus, when you want the camera to continuously [AF-C] auto focus over the entire frame [Wide], basically allowing you to concentrate on other things besides focus, the area is heavily center weighted meaning it places priority on high contrast objects in the center of the frame, if something is around the edge of the frame that is higher contrast and closer, it will still focus on the center items.
Published By: Learning DSLR Video - Wednesday, 2 May, 2018