philiplipetz
Veteran
joe12south,
one snag could be noise when using AF. I've got the 1DXmkII and 70D and the NON STM lenses can get pretty noisy when using AF tracking which in a shooting setup like your talking about wouldn't work very well.
not sure how the GH5 responds to certain lenses though.
david
The newly introduced Dual IS 2 lenses are advertised as being silent focusing for video use. YMMV