Together with the canon 1dxii this is a great lens. ISO 25600 is working, and is sufficient in 95% of situations. Autofocus is fast and accurate. For my tasks, two DSLRs and two lenses 24-70 f2.8 II and 70-200 f2.8 is II are enough, and if you take one, then only 24-70 f2.8 II.