Both lenses to breath a small amount, but again, I don't find that offensive, and sometimes actually even like it.
And if you put on a Ultraprime 50mm or 85mm there's way more breathing that these Canons. I agree with others that say breathing is overblown as an issue. There's some pretty heavy breathing on anamorphic lenses that so many people love.
Sometimes a very breathless rack focus is actually disorienting whereas a breathing lens cues the viewer that focus is shifting.
I think people always need to remember most of this stuff like what Bokeh is better etc. is just someone's opinion. It's not like there's really "right" and "right" costs $20k more. That is marketing.