I will say, I'm a bit envious of Nikon's "slightly slower" supertelephoto lineup
400 f/4.5
600 f/6.3
800 f/6.3
The latter is shockingly affordable. I feel like Canon is really missing out on this part of the supertelephoto market - Canon's RF 800 f/5.6 L is listed for 18k right now vs. $6k for Nikon's f/6.3.
I hope Canon will release some primes like this in the near future.