are the Nikon “S” lenses a gimmick or actually worth it? Alongside the 17-28mm f/2.8 I’m buying, I have the option to either get the 24-70mm f/4S kit lens bundled with the camera, or the 28-75mm f/2.8 lens for a little extra. The latter will complement the 17-28 perfectly because no overlap in focal length between the 2 with the same max aperture, but I’ve been hearing very good things about that kit lens for some reason, despite it being f/4 vs f/2.8 on the other. Thoughts?