Originally posted by northcoastgreg Having a different brand camera for a lens of course complicates things --- although I've seen some great images taken with Pany-body and Oly 100-400. I just have no idea if you're taking any kind of AF hit. I do occasionally have AF hunting issues with the E-M5ii. I've often wondered if it would be better or worse with a Pany body.
From what I've read, by using the Oly 100-400 on the Panny G9 I'll not have DFD autofocus, so it will be conventional CDAF. I don't have too many BIF opportunities anyway, so it probably won't be a big deal to me.
Otherwise, from several reviews and comparisons of the 100-400 lenses I've seen, the Oly seems to be very slightly sharper and have a greater maximum magnification, while the Panny counters by being lighter and more compact, and also having a faster aperture at focal lengths under 400mm.
So far in my excursion into m4/3 I've found that with bodies and lenses, I want some features from one brand and some from the other. The new OM-1 might actually be the ultimate body I want, but it's more than twice the price of the G9.