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I used the 17-40 F4 for several months and loved it. No focus issues, no problems aside from the normal and expected barreling of a WA lens. And like someone already wrote, if you use it the 17-40 F4 outside during good light, F4 is more then fast enough. And for landscapes, you're probably going to use F8 or smaller anyways.
However it was not so good indoors, even with a flash it was just so-so. For my indoor shots (gyms, concerts, auditoriums, large rooms) I needed one extra stop of light, so I eBayed the 17-40 away and replaced it with the 16-35 F2.8.
As for color rendition, contrast, and sharpness? The 16-35 definitely provides better color and contrast, but as for sharpness, the 17-40 is a tad bit better in this area, but not by much.
The build quality of the 17-40 and 16-35 are excellent, and are equal in this area. And in fact, I believe that no 3rd party lens maker makes anything to compete with the build of a Canon L lens.
I would get the 17-40 and save big money over the 16-35 UNLESS you need the extra stop of light (F4 vs F2.8), and/or the extra mm of wide-angle (not a big diff). At about twice the price of the 17-40 F4, my 16-35 F2.8 provides the performance I would require and is worth it to me. Still, of all you use the WA for is landscapes then the 16-35 would be overkill financially.
You should know however that the 24-70mm L F2.8 provides better noticeable color, contrast, and sharpness then both the 17-40 and 16-35, but of course on a 1.6 or 1.3 crop DSLR the 24-70 may not often be wide enough for most of us.
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