Lots of great replies above. But I want to add this:
For me, it's Panasonic's attention to detail that makes the act of transporting the gear and photographing subjects easier and more enjoyable.
For example, the LUMIX 14-28, 16-35, 24-105, 70-300 and 70-200 F4 lenses all use 77mm filters. This makes it super easy to mix-n-match your own personal lens arrangement with a single set of filters. This has allowed me to use - to great advantage - one set of magnetic filters. I just leave a magnetic base ring on all lenses - which does not affect the use of lens hoods - and carry one set of 77mm filters that snap on and off super fast. Back when I was shooting Fuji X, if I wanted their best IQ on the ultra-wide end, I had to use their 8-16 F2.8, which was heavy, and it compounded that weight problem by also requiring square filters. I found that when I moved to L-mount, with the 16-35, 24-105, and 70-300 I actually dropped weight - and this was with the S1R - largely due to the fact that I only needed one set of 77mm filters & the fact that the 16-35 has excellent image quality and is actually lighter than Fuji's 8-16. And because I no longer needed to carry a macro lens (see my next point).
In addition to the consistent filter size, I love the fact that the 14-24, 24-105, and 70-300 are all 0.5x macro lenses. Again, this makes things more enjoyable in the field, allowing me to switch from landscape to detail shots without having to switch lenses. And, again, it saves weight - no need to carry a macro lens, at least for me. Of course, a more serious macro shooter will want a dedicated lens with greater magnification, but I find 0.5x more than adequate for shooting in the wild.
Other features I've enjoyed are the easily accessible Hi-res mode, night shooting mode (where the LCD is monochrome-red, to preserve night vision).
Finally, the fact that their variable aperture and F4 zooms all deliver very-good-to-excellent IQ is huge. Again, saving weight (no need for those heavy F2.8 zooms).
Looking forward to seeing the video!