I had zero knowledge about the multi aspect sensor stuff and honestly I hadn't heard that phrase before now. Gordon Laing made a pretty informative video describing how the GH5s' sensor works. Learn something new every day.
https://www.youtube.com/watch?v=uDaglh-nUmA
The idea of being able to stay at the edge of the image circle when switching to 16:9 or 17:9 from 4:3 is pretty sweet.
I guess I never really thought about how when using traditional DSLRs and switching to 16:9 you have to crop in a lot because of the corners.