the optics quality is not all that makes a good lens. its extremely important, but also speedy/precise auto focus, build quality etc.. Mind you my old Nikkor 300 F/4 ED IF is awesome in every respect. as is the tokina 300 2.8.
But I'm yet to own something that keeps up with the 70-200 F/4 or the 400 F/5.6 L lenses.
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