And was worth it!
To the right hefty price though was the added for an adapter yet, but the results speak for themselves.
Already open brings the lens across the entire zoom range, sharpness, from which one can only dream of having the native MFT-zoom, that again except perhaps significantly more expensive 12-35mm, but even that does not expire until slightly dimmed on to his top form.
Distortion and CAs are quite low, most likely perceived more at the lower end of the zoom range.
Worth a mention is also a push quite nice, quiet Bokeh.
The OM-D with the handling compared to most MFT glasses quite large and heavy lens is surprisingly good, even without the auxiliary handle.
Also, the autofocus on the OM-D works pretty well in combination with the 14-54. Although he is not as fast as with MFT lenses, and of the operation more like a compact camera, so with "Fumble" at the point of focus, but in the end just fail like other lenses.
Conclusion: From the viewpoint of image quality probably at present to recommend the best option for a "Default Zoom" on MFT cameras, and except for action photography all around.