I have the 16-35gm and a 7-200mm Gm II. I am getting more into a wildlife photography and it seems I am always not close enough and desire more length. Does anyone think the 600mm is the best for wildlife photography or 200-400 be the one to get? I want to photography birds, deer squirrels . One day hopefully Bears and Foxes if it happens and also mountain Lions. Oh and also epic big mountains. I guess the new lens 20-70mm would be perfect for wedding photography. But you still need to get close.