Anyone have any advice to go m43 or should I be looking at Fuji and Sony (won't go Nikon or Canon)?
A Sony A7III + a few tiny prime will give amazing result as travel and family camera while keeping the size and cost very " manageable" in my opinion, there is a pretty significant difference in the Image quality between the Sony FF sensor and the MFT, I own both but if I can have one only for a vacation trip, it will definitely be the A7R II or A7R III not my OMD 10 II.
Dan, I see you're getting a lot of opposing feedback on your suggestion from other forum members.
Just wanted to say that it's good to hear different points of view, including yours, especially having experience owning and using multiple types of gear. Some people with an opposing views have similar experience using multiple formats as well, which is partly what makes this topic so interesting.
FWIW I think the A7iii is a pretty impressive piece of kit. And the range of FF lens choices for that system continues to grow. I'm sure I and many others if given a chance to use it would find a lot to like or even love about it.
Certainly, I would agree that at the limits of high ISO and large print sizes, ability to crop more, single shot DR and SNR, and ability to achieve somewhat shallower depth of field and smoother bokeh at wider focal lengths - these are the main advantages of larger sensors, all the way up to medium format.
But there are lots of other considerations besides pure image quality, too, that matter. Ergonomics and controls, IBIS quality, specific lens availability, EVF quality, video capabilities, JPEG engine quality and colors/white balance accuracy, weather sealing, tilt vs flippy screen, battery life, price/resell value, in body charging with USB, on body flash, existing compatible lenses you may own, adapter options, autofocus capability, etc, all are factors.
I think the question is whether the potential image quality advantages realized in practice with the larger sensor bodies are realized often enough to justify the premium, AND taken along with the many other considerations I noted above that are part of the camera experience, together with the kind of shooting that you do ... Well, there's just a ton of room to make different choices based on your own preferences.
FWIW, I'll throw in another likely unconventional perspective.
If you don't need telephoto range and you're mainly a family/travel photographer, and you care mainly about the images and not the photography experience itself, I think the best camera investment available for the price is likely a Pixel 2 or 3 smartphone.
The images these devices are capable of, even in low light with the new NightSight -equipped camera are simply unbelievable. As in, magical, amazing, insanely good. Not good for a phone. Good beyond the capability of anything I've ever seen for anything where some depth of field is desirable. Clean, detailed, sharp, good colors and contrast, low noise, just impossibly, magically good. Don't believe me, though, just go and watch some of the YouTube videos yourself. You can't appreciate it until you see with your own eyes. Once you've seen it in action, you might rethink whether a larger sensor camera (even full frame) is really a good investment.
I'm a very satisfied m43 owner and it will continue be my main camera when I need focal length beyond 50mm FF-equivalent or want to shoot shallower depth of field portraits or indoor sports (I have my eye on the upcoming sigma 56mm f1.4 for about USD$470 for this holiday season).
But a much as I admire the Panasonic G9 or even a GX9 body, my next camera body beyond my current GX85 will almost certainly be a Pixel 2 or 3. And I expect it will do a lot of the general family/travel photography soon thereafter. It will almost certainly be my first choice for any low light general shooting in the 24-50mm equivalent range, not purely for convenience but for quality.
Cheers, and happy shooting.