>>3224651>17-40mm f/4L on a cropYou'll get good image quality with true color rendition and sharpness corner to corner using that lens as a standard zoom. It's also relatively affordable. You can get a used one in great condition on ebay for $325 on the regular (I know because I just sold mine).
The main problem is how large the lens is - it's enormous. The size may be necessary to build such a well-corrected rectilinear wide angle lens that covers a full frame sensor, but if you were to build a crop sensor only EF-S 17-40mm f/4 lens, then it need not be any larger than pic related. With the 17-40/4L, the lens is large enough to cast a shadow when using your pop-up flash at certain focal lengths. The hood makes this issue even worse, but in general, the size of the lens will necessitate bigger camera bags, and cause more strain on your neck carrying it around.
