Oh I think that the D800/D600 will quite easily outsell the 5D3/6D.
Nikon and Sony have completely out foxed Canon.Totally irrelevant. What matters is if they out sell Canon. For the past several years, they have demonstrated a complete lack of ability to do so. Keep in mind, superior technical specs aren't the whole story - if they were, Betamax would have beaten VHS.
For any given pile of money, Nikon has a more compelling story than Canon when it comes to DSLRs.
But again, what you
think isn't relevant. Nor is what I think. What matters is what a majority of people do
Was the 5DII 'more compelling' than the D700? D700 owners sure didn't think so...but those D700 owners were very much in the minority in terms of market share.
As I've said...show me the sales figures, quarterly reports, etc., then we'll know which brand wins. The most recent figures available have Canon with 15% more of the dSLR market than Nikon (and Sony we'll behind Nikon). Those figures don't include 2012 releases, but two years ago there was lots of talk about the entry-level and one/two steps up Nikon bodies being so much better than the Canon equivalents - and still Nikon continued losing market share to Canon.
Keep in mind - the people discussing this issue here are not representative of the market as a whole.
Consider this - brand loyalty combined with lenses/accessories already owned play a major role in future body purchase decisions for most consumers. Canon has a much larger market share than Nikon, therefore a much larger pool of potential upgraders. As long as Canon continues to dominate in the true entry level segment (APS-C sensor xxxD models), they'll continue to outcompete Nikon across the board.