I believe that nikon has better optics than Canon, but then Canon has better technology than Nikon.
Like The Amazing ...IS,USM,DO,L, EYE CONTROL.
But do you really go for the camera because of this?
Or do you go for the camera because of optics?
But don't forget that better technology may also result helping in taking sharper pictures (better optics) for example, you want to take a slow shutter on a holiday trip and got no time to mount a tripod. in this case technology will really help you