In Canon’s signature white, it has all-metal barrel construction and IS, for one hefty lens. Optical performance should’ve been better at 400mm.
Standout Spec: Unique zoom-damping control. It's an extra ring that increases zoom friction when turned clockwise.
Pentax 100m f/2.8 WR DFA Macro
Olympus Zuiko Digital ED 35–100mm f/2
Canon EF 100mm f/2.8L IS USM Macro
Sigma 100–300mm f/4 EX APO HSM
Canon EF 100-400mm f/4.5-5.6L IS USM