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Yes, I see what you mean. The truth is that it is wrong to generalize, often highly dependent on the lenses, processing and other factors ...
Anyway, I had a Sony Nex and several Nikon (D700, D90, D7000, D3s, D800) and overall was roughly over my taste the colors of the OM-D. Perhaps the white balance...
As I say, it's wrong to generalize, but at the level of colors seen amazing photos in the thread of the OM-D. That considering the size limits, screen, color profile, etc.