The original portrait is one of the finest examples I have seen recently of a lens that shows absolutely horrible bokeh. It's not the degree of out of focus that is the problem in the original photo, it is the subjective quality of the out of focus rendering. In the original shot, we can see and identify background elements somewhat, and yet they are well outside the zone of sharpest focus,and indeed, well outside the depth of field band. But there is a harshness, a nervousness to the areas show out of focus. Why? On the smaller-format,high-quality cameras using the 4/3 and micro 4/3 format, lens designers often over-correct for spherical aberration to produce a lens that will cover a very small capture format with an exceptionally sharp, high-acutance image, and the over-corrected spherical aberration will artificially boost the sense of sharpness/acuity, but at the cost of horrible bokeh.
Nikon did the same thing with its 28-200 G series lens; they went way overboard at eliminating all spherical aberration, which made the lens look "Sharp", but also made it render OOF backdrops a lot like this camera's lens does, with very harsh,nervous bokeh.