Canon's EF 70-200mm f/2.8L IS II USM Zoom, more than likely, is Canon's sharpest lens that Canon is offering today !
Currently, I shoot with my dated EOS 5D Mark II and when this lens is attached to it, this lens is used for most all situations needed ~ which include: Portraiture, Landscapes, and for Semi-Macro needs as well.. There is hardly anything that this lens cannot do !!!!
This lens makes one feel as if he or she has a precision piece of combined glass elements in their hands and there is nothing about this lens, when Canon had designed it, that had been overlooked ~ as it is extremely solid and heavy like it should be, it is totally solid without the typical clinking and clunking that long lenses sometime demonstrate, and it produces images that of extreme quality that are off the charts !