What We Like
+Exceptional sharpness even at wide-open f/1.2 aperture
+Smooth, creamy bokeh from 12-blade diaphragm and aspherical design
+Compact and lightweight for an ultra-fast prime lens
+Outstanding build quality with precise metal construction
+Excellent flare resistance and minimal chromatic aberration
+Strong performance across full aperture range, peaks at f/5.6
Worth Knowing
−Significant vignetting at wide-open aperture (3.3 EV) requires stopping down for even exposure
−Focus shift present when stopping down—best results when focusing at working aperture
−Some spherical aberration wide open creates slight glow and reduced contrast
−Can block part of rangefinder viewfinder at minimum focus distance on some cameras