Having owned the Sony A7iii for 2 years and now having the Nikon D780 forget what you've heard about "poor" AF on the Nikon - it's as good as any Sony! The Live-View focus on the Nikon D780 is straight out of the Nikon Z6 whch has been knocked for not being as good as the class leading Sony A7iii. Let me show you a real world view of the Nikon D780 Live-View Autofocus.
