M4/3 as a second?

Well 4/3 sensors currently give you about 7 bit color depth per channel, and about 12 steps of dynamic range, compared to about 8 bit color depth and 14 steps of dynamic range with APS-C and "full frame" non-cropped small format (this refers to Sony/Nikon sensors; Canon offers a bit less than that).

Actually 4/3 sensors give you about the image quality of the 1" sensor Sony uses in the RX100 / RX10. Thats because they dont use the technology juice that Sony uses in those sensors is missing from all 4/3 sensors on the market, such as being backlit.

Olympus cameras offer the probably best sensor based image stabilization on the market.

And unless you use a tripod and the newest Olympus with the sensor shift trick for increased resolution, you'll only get 16 Megapixels of resolution.

I only hear good stuff about the 4/3 lenses though. Plenty of great glas for this, even if the selection is still not as complete as for a Nikon or Canon DSLR.

So if thats sufficient to you - go ahead.

Personally I see no point. I'm rather tall and not outright weak - carrying a DSLR isnt too much of a hassle to me. Especially since I've picked the most lightweight ones and lightweight lenses as well. Also, one of the most important properties for me is lowlight performance - obviously larger sensors have advantages there.

As a money saving option, 4/3 is IMHO a poor choice. The really good cameras are actually more expensive than almost all APS-C options (except the Leica T and the Fuji X-T1), and the really good glas is just as expensive as great glas for APS-C or full frame.
 
When I go on Vacation, I take a GM1. The ergonomics are a bit sketchy but the size is perfect.
 
Well 4/3 sensors currently give you about 7 bit color depth per channel, and about 12 steps of dynamic range, compared to about 8 bit color depth and 14 steps of dynamic range with APS-C and "full frame" non-cropped small format (this refers to Sony/Nikon sensors; Canon offers a bit less than that).
Where do you get these numbers from?
A quick look at DXOMark shows they found the GH4 to have about 1 stop more dynamic range than a canon 5D mark III, with colour depth between the 70D & 5DIII. Note the Canon comparisons were selected by them not me!
 

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