Canon 400mm f/5.6 USM 'L' lens review with samples (APS-C and full-frame)

Here's a lens with difficult parameters but apparently legendary optical quality - in fact I had a surprisingly fun time testing it out. Could this be the ultimate wildlife lens for those on a 'budget'?

Find it here (Amazon affiliate link):
https://geni.us/canonef400mmf56USM

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All pictures and footage shot by me on Canon 6D and 70D cameras.

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Music:
'Opportunity Walks', Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/