Recently, Canon invited me to test out the much-awaited EF100-400mm f/4.5-5.6L IS II USM, and I took it with me on an assignment. The EF100-400mm f/4.5-5.6L IS II USM has all the new features found in the newer Mark II super telephoto lenses: new PF mode; new 4-stop IS; new IS mode 3; new Fluorite coatings; new "whiter" white looks and more.