Sell your G9 with the armada of lovely lenses and just use your phone. Then you'll really be mobile.
Yes, mobile with no camera.
I think you would need a very low end or very old mobile to have no camera on board
A M43 setup weights the same as a bottle of water or a smartphone with a portable battery pack.
That rather depends

There are plenty of large heavy and expensive m43 options especially if you actually compare truly to equivalent lenses in other formats. Which many m43 users avoid doing like the plague .
Given the sensor size the E-M1X is comically large. Stick on any of the F/1.2 primes. You would need to be comparing it to a 2l bottle of water or a 1980's mobile phone
The Olympus 25mm F/1.2 does the same job { diagonal AOV, DOF/subject isolation and of course the most important same total light gathering } As a FF 50mm F/2.4 whilst there are plenty excellent F/1.8 50mm lenses most smaller lighter and cheaper than the Olympus lens. The closest to F/2.4 is the Sony 50mm F/2.5 .
The A7c is limited in features and holds little appeal for me . Unfortunately all the smaller m43 options are also limited in a number of ways, with lower level build quality and lesser feature sets. So every option is a compromise that damn perfect camera is as ever elusive
For those bemoaning the weight of FF gear there is the two stop difference between m43 and FF . The Sony 1" sensor cameras are genuinely tiny and the difference is only 1 stop between them and m43 and this advantage is often sacrificed as just with other formats the smallest m43 zoom lenses are slow
The smallest current m43 camera { I think } the E-M10 IV with the smallest m43 zoom the Panasonic 12-32mm F/3.5-5.6 . Next to the Sony RX100 V , which has an amazing feature set that outperforms the E-M10V in many areas from AF points to FPS . Though we have one and my wife loves it the handling is for me is woeful however it's 8.8-25.7mm F/1.8-2.8 does the same job { diagonal AOV, DOF/subject isolation and of course the most important same total light gathering } as a m43 12-35mm 2.4-3.8 , which negates any sensor size noise advantage . If size and weight is the absolute goal the Sony RX100 models are very difficult to beat.
I see you are one the "new" crop of m43 users who joined in the past month . Nice to see such enthusiasm for m43 in a new poster ;-)
--
Jim Stirling:
“It is one thing to show a man that he is in error, and another to put him in possession of truth.” Locke
Feel free to tinker with any photos I post