There are a few folks here who feel that those of us who own the 5D3 are trying to downplay the 1DX so that we don't have to regret our choice to go with the 5D3 or be jealous of the 1DX.
I don't think there's any doubt that the 1DX is just the better camera. Of course it is. Several folks went over why it's the better camera including build, dual CF card slots, spot metering on the selected AF point, 12fps, 1 stop improvement in noise, form factor, etc, etc, etc.
Personally, as I've mentioned before, I used to shoot with a 1 series body, and the Nikon D3 and D3s, so I do have appreciation for the top of the line cameras. Typically, you also did get more features, perhaps not in Nikon land, but definitely in Canon land. All you have to do is look at the AF difference between the 1D3, 1Ds3, and the 5DC/5D2 to know what I am talking about. HUGE difference.
That has completely changed with the 5D3. When I read the specs, I immediately knew that was going to be good enough for wedding photography and it has been. Would the 1DX be better? Maybe. The 1 stop high ISO advantage would definitely come in handy. 12fps? Meh. Dual CF card slots? Sure...I hate having to buy SD cards! Build and sealing? Possibly...if I am shooting in the rain or in challenging elements, which is not too often. Again, not excuses, but reality for what I shoot, which is weddings.
I like using 2 of the same cameras, so I'd be getting 2 1DX cameras. That would be $6k+ extra. That's a personal decision that I would have to make. (Obviously, I already made it...sticking with my 5D3). I can afford it, but I choose not to go with the 1DX.
But never say never...