.. The lenses are truly to die for.
Canon lenses are indeed above else (well with some minor exceptions e.g. Nikon 14-24, some Zeiss stuff).
Now as a Nikon owner I feel even primes are not that good. Lack of 1.2 aperture in the choice, 35mm 1.4 there should be much less distortion for that kind of lens. The Nikon 70-200 is breathing a lot at the long end and the locking distance is 5m rather than 2.5m etc.etc.
I still keep watching Canon's advancements though I feel there is less and less excitement going on (for me).
Nevertheless Canon seem to be doing fine and is a good choice for many.