I have been a long time M43 user since they released the very first OMD-EM5. And the OMD line has been the best camera for the everyday user - highly capable, small with amazing small lens that really are great. The Olympus 45, Panasonic 20mm and the 80-150 are truly some the greatest lens for any system. Shure, you loose some depth of field - but for 95% of the people it is perfect. However, when I was ready to upgr…
Your points read very strange:
Cost: you are omitting the cost of the lenses. See how much FF 600/f4 will cost you compared to Olympus 300/f4 Pro.
Size: ditto. The camera body is half of the story. You need to compare the whole system with lenses.
Compatibility: there is a gazzilion lenses made for m43 by Olympus, Panasonic, Sigma, etc.
Video: The latest releases E-M5m3, E-M1m3, E-M1x are no threat to Panasonic but are perfectly capable video cameras. Even E-M1m2 was reborn with the new firmware.
Some other advantages:
Weather proofking—second to none.
IBIS—second to none.
Quality optics: Olympus pro lenses can be used wide open without significant loss of the quality. This is not the case for most of the high end FF lenses.
Computational photography: Live Time and Live Composite are amazing. High-Res handheld mode is amazing. Live ND is a nice option. Starry AF works perfectly.