Here you can see a comparison between the OM-D E-M1 and the PEN E-P5, both using the M.Zuiko 17mm F1.8 lens. It's a lens that's rather prone to lateral chromatic aberration and the E-P5's inability to correct this is something we've highlighted in that camera's review. The E-M1's image is essentially indistinguishable from the PEN's, except for its complete removal of the otherwise distracting CA from the edges.