>>4357453We can tell its pseud BS with a simple test:
The canon RF 50mm f1.2 L vignettes more than the sony 50mm f1.2 GM.
Mount diameter doesn't really limit lens design in a meaningful way unless you are developing lenses for cinema or machine vision where full optical focus breathing correction (cinema) and total telecentricity (machine vision, zero-perspective optics) are required.
If anything mirrorless mounts are excessively wide and excessively shallow. yes, it makes more room for larger glass elements, but does anyone care about pixel level sharpness that much more than not having elephant trunk optics
