Nailing the focus point at f/1.2 can be tricky, but when it's right it is highly effective
central sharpness is excellent at all apertures
corners need f/4-f/5.6 for maximum sharpness where the centre is also sharpest giving edge-to-edge even sharpness
almost no colour fringing with well controlled CA
flare is well controlled
minimal +0.57% pincushion distortion
smooth bokeh