Ed has summed it up quite well.
Nikon don't have a modern equivalent of the Canon 400 f5.6. The 300 F4 gets good reviews and can be coupled with a 1.4x teleconverter to achieve a similar result. The 80-400 is the "entry-level" long zoom lens, after that, the prices become really offensive!
Not sure about their compact stuff - we've got a G12 for that side of things.
DT
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