Hmm. Wide, cheap, sharp, fast. I think you need to decide which three (or maybe two) of these attributes are most important to you.
Compared to the 17-40mm f/4 L, and assuming you want a zoom:
* the Canon 16-35mm f/2.8 L Mk II is a tiny bit wider and a stop faster, but it's considerably more expensive
* the Canon 16-35mm f/2.8 L Mk III, due any time now, should be a lot sharper, but it will certainly be very expensive
* the Canon 16-35mm f/4 L IS is a tiny bit wider, and sharper, but not faster and more expensive
* the Tokina 16-28mm f/2.8 is a tiny bit wider and a stop faster, not too expensive, but I don't know what it's like optically
* the Tamron 15-30mm f/2.8 is a bit woder, and a stop faster, but more expensive, and I don't know what it's like optically
* the Sigma 12-24mm f/4.5-5.6 is very wide, reasonably sharp, not too expensive, but slow
* the Canon 11-24mm f/4 L is much wider and superbly sharp, but not faster and eye-wateringly expensive