Yeah they are the market leader but look at their products
Which is more important to overall IQ - the body or the lens? Remember that we're talking about systems here, not just camera bodies. Across the lineup, I think Canon has better lens offerings (with some exceptions, like the Nikon 14-24/2.8, and a 200-400/4 that actually exists). The 24-105/4L, 400/5.6L, 100-400L, TS-E 17, MP-E 65, 28-300L are excellent lenses for which either no Nikon counterpart exists or the Nikon counterpart offers significantly worse IQ. The Canon 200-400 will come, and for landscape shooters, the Nikon 14-24 does great on a Canon body with the Novoflex adapter, and that's a situation where AF is generally not needed, while the unique Canon lenses cannot be mounted on a Nikon body at all.
You made an abolute statement that Canon is somehow behind, which on the surface apears to be a post to illicit a response from those Canon users that are dedicated to their equipment.
This is true - the thread title is clearly trollish in nature. Anyone with a few posts on CR who's been here for a couple of months should not be naïve enough to think a topic like this won't draw in other trolls like moths to a flame. Expect a thread lock or deletion when this thread descends to flames, which is probably inevitable. If one is legitimately asking for opinions on moving to Nikon, fine, there are better ways to do that than trolling.
@leolol - This isn't the "I'm thinking of switching to the Yellow side" equivalent of a suicide hotline. If you think the D800 is better, rent one to see if that's true, or just sell your Canon gear, take the loss and buy a D800. Who knows, maybe the grass is
greener. For sure, it will require a lot more water and fertilizer (aka data storage capacity and CPU power). Just do it. Or not.