Canon today announced a couple of lenses; an EF 16-35mm f4 IS lens ($1,199), and an EF-S 10-18mm f4.5-5.6 ( $299 ). Interestingly, the announcement of the 16-35mm f4 lens seemed to have prompted a rather ho-hum reaction; some saying they'd stick with the EF 16-35mm f2.8 , while others suggesting that the Sigma 18-35 f/1.8 is a better deal. As someone who likes wide-angle lenses, owns the EF 16-35mm f/2.8, and has used the Sigma 18-35, I thought I'd weigh in on this new lens too! Firstly, like Stu Maschwitz , I think I'm going to stick with my f2.8. lens. It's a nice solid lens. The Sigma lens is nice too, but it's not quite as wide, it doesn't work on full frame cameras, and I didn't find that extra 1 1/3 stops a must-have feature when I was using it. The new Canon f/4 16-35mm lens includes IS, which is useful if you're moving the camera around, but other than that, this lens doesn't really stand out when compared to the other two. What i...