I wish every lens was this good!! I just love the lightning fast & accurate focus of this lens. It focuses within a blink of an eye, instantly. Focus are dead on with my Fullframe or APS system. It's an ideal portrait lens. Bokeh is buttery smooth, best you can get from a 135mm.
f/2; fast-accurate-silent focus; (relatively) small & light; super sharp!
IS version could be nice