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I get it with respect to the f/2.8 having its place in the camera bag vs the new f/4 ... faster shutter speed in low light to stop action, but the harder comparison (to me), is the 24-105mm f/4 vs this new 24-70mm f/4. Sure there is the almost-macro on the new lens, but the reach is not there. Then the almighty price differential ... the 24-105 is significantly less than the new lens. Any thoughts?