Slower by one stop, lighter in weight, much lighter in price than Canon’s 16–35mm f/2.8L, but comparably sharp, this lens is a favorite of landscape shooters. Distortion goes to Very Visible barrel at 17mm, though.
Standout Spec: "L" of a good price for an L lens.
Pentax 17–70mm f/4 DA AL SDM
Pentax 10–17mm f/3.5–4.5 DA Fisheye
Tamron 17-50mm f/2.8 XR DI II
Nikon AF-S DX Zoom-Nikkor 17–55mm f/2.8G ED
Tamron 17-50mm f/2.8 XR DI II VC