Nikon vs Sony: Wildlife Photography (D850 vs a7R III vs a9)

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Chelsea's trying to decide if she should switch to the mirrorless full-frame Sony a7R III (). So far, the Sony has won for travel photography and portraits. Will Sony beat Nikon for wildlife photography? Chelsea's standard wildlife photography rig is the Nikon D850 (), the Nikon 600mm f4 () and the Nikon 1.4X teleconverter. Sony doesn't currently have a 600mm f/4 lens, but they do have a 400mm f/2.8 (), and with a 2X teleconverter, the focal length and speed are about the same. Can the a7R III keep up with the D850's focusing? Is the image quality good enough despite needing a 2X teleconverter? How does the Sony a7R III's higher frame rate and silent shooting factor in? And what about the Sony a9-which has an incredible 20 FPS frame rate and a better focusing system?
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