Actually, there’s no comparison.  It’s not even close.

In the sensor tests over at DxOMark, the Nikon D800 whomps the crap outta the Canon 5D Mark III in every category.

Okay, sensors are just a part of the overall package.  Still, Nikon’s gotta be feeling pretty happy about this.  Now if they could just make enough of these things to fill the demand ….