These pages provide a solid basis for understanding what to expect for image quality from the E-M1.
Update: the Choice of Color Space for Raw Conversion article is a good test for whether your display is up to snuff in wide gamut and calibration.
On my NEC PA302W (and even my 3-year-old LCD3090WQXI which us older than my NEC PA301W), the difference between sRGB and ProPhotoRGB is quite obvious and substantial*. But even on high quality laptops such as the MacBook Pro with Retina display, the gamut is relatively narrow.
If you can’t see it, you can’t edit it properly. Digital cameras have awesome gamuts these days, and printers now exceed AdobeRGB. Don’t whack your images in editing by literally blinding yourself to color. Don’t get suckered into faux calibration, and don’t calibrate to a truncated gamut.
Recommended wide gamut displays (PA302W is first choice).
* Note that all iOS devices ignore color spaces, so they are useless for displaying anything but sRGB, and iOS displays any other color space incorrectly (usually flat and dull).