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I just don't understand why it is so much more expensive than the Canon version. I got my used 70-200 F4 IS for about $900, whereas I can't seem to be able to find any used 70-200 F4 VR for less than $1200-ish. That, and the fact that it would cost me at least $1000 more to replace my 100-400L (purchased used for $1250) with a used 80-400G, is what's keeping me from considering Nikon.
Both the Nikon 70-200 f/4 and 80-400 AF-S are new lenses with new tech that just came out. The Canon 100-400 and 70-200 /4 have been out for many years. That's the reason for the high price. When Canon comes out with updated versions of these, they will also be in line with the Nikon price.