Here is a Canon RF 100-400mm f/5.6-8 IS review. One of the less expensive lens…
Here is a Canon EOS R5 review. Good thing not everyone is wasting his time on the ridiculous overheating issue.
No Life posted a rather comprehensive review about how (well) IBIS (In Body Image Stabiisation) works on the new Canon EOS R5. He says:
The Canon R5’s long awaited “next-gen” IBIS is best-in-class, and well worth the wait. And you’ll see there are no “wobbles”. Why aren’t more people talking about how insane it is we have a 4K, FF camera, with 10-bit, flip out screen, and best in class AF / IBIS?
The review examines the interplay between IBIS and OIS (Optical Image Stabilisation, i.e. the image stabilization inside the lens), which seems to be a major achievement by Canon.
Canon EOS R5 body and kits preorder links: