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In my opinion, the 17-40mm f/4L on a full frame is an excellent compromise over the 16-35mm f/2.8L II's extra stop of aperture. If you're shooting landscapes, I don't know of a situation where you'd need f/2.8. Typically, for depth, landscapes are shot at f/8 and smaller. f/8 also just happens to be a sweet spot for a lot of lenses.
If you were shooting indoors, f/2.8 would make sense.
For general purpose, all day, walk around lens, the 24-105mm f/4L is pretty much hard to beat.
On the 350D, you would want to look for something in the 10-22mm range for almost equivalent field of view.
On an unrelated note, you lucky so-and-so -- Canada, eh! Maybe next year for me.
H
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