One thing about Nikon is that they've always used a more advanced process technology in its same generation camera compared to Canon. If Canon used .5um, Nikon

One thing about Nikon is that they've always used a more advanced process technology in its same generation camera compared to Canon. If Canon used .5um, Nikon would use .35um, for example. This always helped with the ISO sensitivity & dynamic range of Nikon's sensors, which were always less noisy than Canon's. The Nikon D3 changed everything, for example, by allowing impossible shots at sensitivities previously unheard of.