I picked up a 17-35mm (as I could find a decent 17-70 in my area).
I haven't used it that much ... but the test shots I have taken with it (no newspaper or wall shots) have been pretty decent.
I have yet to shoot landscape with it ... when i get a chance though I will give it a run. So far though dark indoor shots seem to render nicely.
The Sigma 17-70 would be a more flexible lens ... but the older 17-35 is still pretty sharp.
A couple of test shots can be found here ... I have more offline though at home
http://mechan1k.zenfolio.com/p909004234