Is a D800 worth $6k?
I'd say it's not.
I agree with D7100 comment, for 95% of the shots there is no difference.
Sounds good to me. That's how I got my $10K 200-400.
I'd sell some DX gear so it doesn't actually add up to you having to pay $3000 for your D800. I did that myself to decrease the wife impact factor.
Note, you seem to do some landscape work and own some really good FX lenses so I think it would benefit you to own a D800.
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