https://mirrorlesscomparison.com/stories/sony-a7r-v-bird-photography/
Mathieu follows a predictable process for scoring this. You may or not agree but generally this in time demonstrates to be true.
The interesting comment is at the beginning of the BIF section, take into account this is burst mode. The issue with focus accuracy are mostly related to the fact the camera reads slowly so even if the detection and focus acquisition is good it can't keep up tracking.
If you were hoping to see a higher score with this new camera, that’s unfortunately not the case. Frankly speaking, the A7R V behaves mostly like its predecessor: fast in locking onto the subject, very good tracking capabilities, rarely mis-focuses on the background, but I also encounter limitations related to focus accuracy.
Shooting underwater in CAF single shot should bear better results as subjects are moving much more slowly however there is a risk that even with the camera saying it has locked focus the camera misfocuses due to the very slow read out (1/15). It would be interesting to hear from people shooting smaller fast moving objects how this camera goes
