I cannot imagine that any lens could have better build quality and image quality than the Canon 500/4. It's a safe bet that Nikon are just overcharging. Of course, Nikon's costs will be higher, as Nikon only sell a handful of super-tele lenses (look at the press pit for any major sporting event and count the white lenses) where Canon sell heaps and gain economy of scale. So maybe it's not just greed. Still, it's your hard-earned at stake here.
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