This is quite interesting. I am usually happy with the picture quality from Shaw, but every now and then with some fast motion i can spot the compression artifcacts (macroblocking usually) and it annoys me. But it's not always consistent, even on the same channel. It's as though they change the amount of compression (or compression type) on some channels.
Is there a list of which channels are in mpeg-4 vs mpeg-2?