I was watching the NBC coverage of the Wings/Penguins finals just to get a different perspective from RDS or the CBC. Sometimes I put both feeds on the split screen and judge the camera work and picture quality.
Yesterday, I encountered a weird problem, the NBC feed was six seconds behind the CBC feed and was actually being broadcast on a slight tape delay, at least on Bell Expressvu. The whole third period (at least) was broadcast this way.
I've seen this happen once before when comparing a RDS feed with that if the CBC in a Habs/Leafs game. The CBC feed was up to 12 seconds behind RDS, but it happened because the CBC was late getting back from a commercial and they caught up at the next commercial break.
At any rate, the picture quality (on my TV) was decidedly better on the NBC side and the camera work a little crisper with quick angle changes, especially in the corners.
There was a time, years ago when FOX broadcast the games rather amateurishly and even added a glowing puck. NBC coverage was definitely as good or better than the CBC.