Image quality and distortion test results along with standard product images have been added to the Canon EF 16-35mm f/4L IS USM Lens review page.
I was very anxious to get my hands on this lens. With well over 1000 shots captured with it so far, I am now loving this lens and expect it to become one of my most-used lenses. The 16-35 f/4L is very sharp across the frame, AF is very fast and extremely accurate and IS works very well.
Here are a couple of relevant comparisons:
Canon EF 16-35mm f/4L IS Lens compared to Canon EF 16-35mm f/2.8L II Lens
Canon EF 16-35mm f/4L IS Lens compared to Canon EF 17-40mm f/4L Lens
Completion of the full review is my current highest priority.
B&H has the Canon EF 16-35mm f/4L IS USM Lens in stock.