ok and the more i watch it the difference isn't so much quality but picture type.
the CBC Toronto/Shaw feed is much darker in contrast. The colors and black are very deep, too deep really.
The CBC Vancouver/TELUS feed is more even. Not as sharp as Shaws/Toronto feed but not necessarily in a bad way.
One thing I noticed was during intermission the grainy picture doesn't show up on TELUS.
Overall I dont think I'd say either is a big advantage over the other. Just a little different.