One Out Of 33
Shooting Sony a9 body, with Metabones EF-to-E adapter version V, driving a Canon 500mm lens. I'm using "Wide" focus, which uses more than 600 AF points and moves the focus points around as the subject moves within the frame.
This snowy egret flew around several other snowy egrets as I took 33 shots, with only one out of focus. In the one that was OOF, the camera grabbed onto another egret, but by the next frame was back on this bird.