Canon RF 400mm f/2.8 'L' IS USM lens review with samples

This is literally the highest quality camera lens I have ever handled - physically awesome, optically impeccable...and incredibly expensive. Canon have been honing the craft of designing and producing these lenses for years, now: what can this latest version achieve to make it worth its asking price?

All pictures taken by me on a Canon EOS R5 camera.

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Equipment I use to make my videos (Amazon affiliate links):

Canon EOS R5: https://geni.us/CanonEOSR5Body
Canon EF-RF Adaptor: https://geni.us/CanonEFtoRF
Sigma 50mm f/1.4 'Art': https://geni.us/Sigma50mm14Art
Canon RF 35mm f/1.8 IS STM: https://geni.us/CanonRF35mm18Macro
Marumi Fit and Slim CPL Filter: https://geni.us/MarumiFitSlim77
AudioTechnica AT2020USB+ Microphone: https://geni.us/AT2020USBPlusMic
Rode Smartlav+ Microphone: https://geni.us/RodeSmartLavalierPlus
Rode SC3 adapter: https://geni.us/RodeSC3MicAdaptor
Zoom H1n Recorder: https://geni.us/ZoomH1nMiniRecorder
DJI Mini 2 Drone: https://geni.us/DJIMini2FlyMore

Music: 'Sidewalk Shade', Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/b...