This is the mark II edition of this lens and isn't just a minor tweak but represents a complete redesign. It boasts an extra two elements, taking the total number from 11 to 13, and its more rounded aperture is based on eight rather than seven diaphragm blades.
Quality metal construction; Ring-type autofocus; Wide maximum aperture
Disappointing sharpness; Expensive; Vignetting (corner shading) at maximum aperture