Tyler,
I can't talk about that particular lens but I can discuss the focal length: my most used lens is the Canon EFS 17-55 F2.8IS. It's what I use for show formals as well as many of the studio portraits I take.

As for Sigma lenses, I've used them for years and generally agree that they provide a very good price/performance ratio. Ten years ago, I purchased the Sigma 70-200 F2.8 AP DG EX HSM because I couldn't afford the Canon L equivalents. It was a great lens and even when coupled with the Sigma 1.4X Telextender, it provided amazingly sharp images. I still have several on my wall as 16X20 prints and when I compare them with prints made from the 70-200 F4L I purchased after the Sigma, I have to admit the Sigma images are sharper. All of which underscores that all manufacturers are capable of making really good lenses but manufacturing variability can make a truly great lens not quite as great. Oh, and Sigma lenses are built like the proverbial tank.

Good luck.

Jim