Here it is on the K20D, shot at ISO 200 and f/2.8. As always, click through for larger images in Flickr if you wish to examine in more detail.
Here is the shot on the E-P1, also at ISO 200 and f/2.8.
To aid in comparison I took a 100% crop from the centre of the image at various apertures. First the K20D.
And then the E-P1.
I will make three observations. First, I used Auto White Balance with no processing; the difference in colour is apparent. Second, the increase in noise in the E-P1 images is apparent.
Finally, the E-P1 produces smoother bokeh. I have no explanation for that.