Autofocus is not the only thing people are looking for when they are looking for a camera for video. Nikon has long had autofocus problems when creating a video that had just improved with the d850 and the z7.
Canon has a very good autofocus system with its dual pixel autofocus and a lot of people really like the color directly to the camera because it gives pretty good skin colors.
Sony is also good at autofocus and has good color science.
The biggest problem with the Nikon video was the codec, because Nikon introduced the diary with the z7, where Canon and Sony had it a long time ago and with the diary, you get a much more dynamic range.
But also this subject is not related to the photo (apart from the fact that the cameras can also make photos) and should be put to video.stackexchange.com