Doesn't matter, since Nikon doesn't build f1.2 lenses for their system Canon will keep them coming :-p ... no matter if f1.2 with current sensors is really necessary or how many people actually are able to focus them wide open.
...or how much Canon has to secretly push the ISO to compensate for light lost due to the extreme oblique angle of light from an f/1.2 lens, especially since higher sensor pixel density means more push is needed.
No, you're not getting away with that, Neuro!
In an earlier thread, you objected to my saying something like "secretly" about this issue, by retorting that it is explained in some documentation somewhere (I forget the link), and is therefore not a secret.
You can't have it both ways. Stop sitting on the fence. Make your mind up, and stay with it!
You mean this thread
? I wasn't objecting to you calling it sneaky, it is - Canon, Nikon and Sony certainly don't publicize it. But Canon doing it
secretly doesn't mean it's really a secret. My point (objection, if you like) in that thread was the lack of novelty - someone observed the phenomenon on one thread, you replicated it, but it wasn't news - DxOMark had previously quantified the effect (on multiple brands) and published the data. Next up on new discoveries - when you focus your lens on a close subject, you're getting a shorter focal length than printed on the barrel. We can run out and do a bunch of tests to confirm that......but it might be easier to just Google "focus breathing".
Marsu42, the DxOMark data are here