[Klaus]

Oly and Pana have their specific niches, to be fair.

Pana MFT is the video king whereas Oly focuses on the outdoors.

However, if you want awesome video support you can as well go for the Pana S5.

I'm not so sure whether Oly's game on toughness can play out. Yes, they are the only ones with an IP53 rating. However, I have never had any issues with cameras during backpacking trips.
And who shoots during a snowstorm or hurricane? Very dusty environments may be a use case where it really matters, I guess. The anti-dust shaker in the Sony A7R V has a higher frequency than Oly's though.