[mike]

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.

My most abused camera for a long time Canon Rebel (650? something like that). There was a time where this was my travel camera. Much nicer carrying this around than a 1, smaller and lighter. I think because it was relatively inexpensive, I beat the hell out of it. It went backpacking and around the world. Most of the time it was tossed in a daypack with no padding. I also live in the desert with a lot of wind and dusts. Besides dust on the sensor, never had any issues. I've always thought these weather ratings were kind of overkill. More pertinent to a news crew. Just use a little common sense to keep the camera -mostly- protected. 

After my gear was stolen, I picked up a Pen-F and a few lenses to replace the Rebel for travel. Still love. Can't beat it. No one has ever told me to put it away. You can carry it in one coat pocket and a different lens in the other.  Or my whole setup fits in a Think Tank MM 25i (~28x14xx14 cm) lenses, flash and body plus accessories. Smaller than my GF's purse.

I do agree they're a little pricier than I think they should be. Some models are so big they negate the point of MFT; IMO.