I bought a D800 after reading the hype. It was a waste of money, I sold it and bought a 5D MK III. The D800 appeals to armchair spec readers, but few that actually use one are happy.
And you interviewed how many D800 owners to come up with this conclusion???
If you prefer Canon over Nikon, great. Lots of people do. But to make a generalization like that is a bit much.
Is it really so hard to admit that some people like their Nikons just like some people like their Canons?
different tools for different things man. In the wedding industry here, the d800 took a while to catch on. Most nikon guys I knew were opting for a d3s or a d4 or a used d700. The few that did snag a d800 did like it for the posed formal shots, but stayed away from making that the primary camera ---not because of IQ or capabilities but because of file size. More of that crowd is snagging d810's now, because it is a better camera than the original model, and because it's a few years later - the d4s is pricey and their d700's are reaching the end of their cycles....so they are buying the d810 now because they don't have much choice.
It's been a couple years now as well, and computing power has progressed as well. It's possible to pick up a high powered ultrabook with eight gigs of ram for under $1500 now. I picked up the Dell XPS 15 with 16gig of ram for under $2000. My desktop computer used to struggle a bit with a D800 NEF, however after my upgrade near the beginning of the year, it has no problems with them now. (I also moved to Lightroom 5, not sure if Adobe included any performance improvements for handling large RAW files.)
I don't think the file size issue is really as much of an issue before, and if it still is, it won't be for long.
I know two portrait/wedding/event photographers who both own D4s and D800s (one is picking up a D810). They have raved about them since they got them. I asked about the file size issue a couple years ago as well, and for one it was a small issue but not enough to prevent him from using the camera. For the other, it was never an issue. They both pick the camera for the scene...D4 for the higher ISO shots, D800 for the lower ISO shots.
They are well-invested in Nikon glass, no reason for them to ever switch, but they aren't unhappy with the performance of their tools for their job either.