The Canon EOS R5 (B&H Photo/Adorama/Amazon) has already released, and currently is the best selling full frame mirrorless camera in the world. Here is the Eye AF comparison about Canon EOS R5 Vs. Sony a7R IV Vs. Nikon Z7 by Youtuber Jared Polin.
Canon EOS R5 currently is out of stock everywhere, you can take a look at EOS R5 in stock tracker here.
Canon EOS R5 – $3,899 – Pre-order at B&H Photo Video/Adorama/Amazon/Focus Camera/Wex UK/Park Cameras/CalumetPhoto DE