This page looks at Eye AF on the Sony A1 at f/1.4 using the camera on a tripod and a static subject, to see if the hit rate might be better than the handheld human Eye AF results which were fairly hit-and-miss. AF-C mode. In other words, this test is better controlled, but also not realistic for handholding a human subject, both of which move continuously.
The idea being that if the photographer is moving even a little and the subject moving even a little, this could easily total a few millimeters. On the flip side, if the Sony A1 is focusing hundreds of times a second, that should be amply fast to compensate.
Includes crops showing/evaluating the hit rate.