Well, to be clear, Bell's HD PQ is still very poor IMHO. It has noticeably improved in certain programs in the last few months, but it's still not near the original quality a few years ago. Some programs seem relatively compression artifact free, but are still much softer than they were before. Others are a bit of a mess (sports, mostly) with artifacts and such. Even a couple of years ago the 1080i programming would have lots of macro-blocking on fast changing scenes, but at least most of the time it was fairly pristine.
On my 53" 1080i rear projection TV, the most noticeable difference is the lack of "pop" and depth in the picture. Looking at a typical prime-time program is usually not objectionable (like it was late 2007, early 2008), but lacks the "wow" factor that used to be present. And no, this is not just my perception changing over time, the WOW is plenty present when I view BluRay content on the same setup. I'm not sure if it's over-compression or the down-rez to 720p vs 1080i at this point, but it still doesn't resemble what it could / should / was intended to be when the broadcast HDTV specifications were created (1 1080i MPEG2 channel per transponder).
Someday we'll be able to download real HD quality programming over fibre, until then, we're stuck with the lowest-common denominator (more channels, less PQ). A lot of people can't really tell the difference between mediocre PQ and good PQ, but they value more channels, even if they'll never watch them.
Unless a premium HD service were to emerge, but be ready to pay for it.
Regards,
Ken