I am loving the 5D3 everyday since I bought it. In my view it delivers more than I expected it would. I usually get buyer's remorse for expensive stuff - but I never had that with the 5D3 with the grip. Is there any reason why you think the 5D3 "did not deliver"?
I would still be happy with the 6D if I bought it - it would be like my already sold 60D but with full frame and two more AF points (I miss that camera!) The 60D is "just" APS-C, but it still delivered great performance for me when I had it, but having a full-frame now upped my standards (though I can still get very satisfactory images with the 60D). Heck, I'm still happy with my 7D, Rebel 2000, and AV-1.
My point is, please don't get hung up on specs - get yourself a decent camera - be it Nikon/Canon/Fuji/Sony, learn its strengths and weaknesses, and enjoy shooting with it.