In this video I compare sensor sizes to illustrate why I never apply crop factor to aperture. And If you don’t know what crop factor is, then don’t watch this video. Because it has no real impact on your photography or videography.
Use your cameras and lenses as they sit today. How it may or may not look on other systems isn’t really relevant when taking pictures or shooting video.
I have written some additional thoughts (rant) on my site www.gunpowdervideo.com.