In terms of image quality, the lens creates some nice bokeh effects when shooting wide open at f/1.2, creating an attractive dreamy look, but you really need to stop down to f/4 to get critically sharp results in the centre of the frame, with the edges slightly worse. This lack of sharpness may actually be a plus-point for portrait shooters who want a more romantic look – just make sure that the image quality fits your particular bill. Chromatic aberrations are commendably almost completely absent, but vignetting is pretty bad at f/1.2, not disappearing completely until f/4.