This is a great lens. In typical Olympus fashion it is a pleasure to shoot with. Handling on the 6D is effortless. Sharp from f2.8 up and from corner to corner. This lens is sharp with absolutely no visible falloff in the corners of any kind. Image rendition is excellent. Bokeh is very natural and quite smooth wide open. Colors are spot on. Contrast is excellent and very consistent. Shadow detail is crisp. There is a bit of fringing at f2.8 in extreme lighting, but it's minor. The possibilities with this lens seem endless to me. Cityscapes, landscapes, portraits, studio, macro (just add a few extension tubes), Grayscales images look quite nice thanks to the beautiful contrast of this lens.
See the comparison pic below which was taken with a Canon 100mm f2.8 USM Macro.