Here is a Canon RF 100-400mm f/5.6-8 IS review. One of the less expensive lens…
Dan Watson posted a 20 minutes video where he compares the Canon EOS 5D Mark IV () with the Sony A7R III () and the Nikon D850 ().
The comparison is all about skintones, low light performance, dynamic range, ergonomics, and more. You can download the raw files used for the comparison from here.
Canon EOS 5D Mark IV: Amazon
Sony A7R III: Amazon
Nikon D850: Amazon