Compare Olympus M.Zuiko Digital ED 100-400mm f 5-6.3 IS Lens vs Panasonic Lumix G Vario 100-300mm f 4-5.6 II POWER O.I.S. Lens vs Panasonic Leica DG Vario-Elmar 100-400mm f 4-6.3 ASPH. POWER O.I.S. Lens vs Olympus M.Zuiko Digital ED 75-300mm f 4.8-6.7 II Lens