Launched back in spring 2007 the EF 16-35mm f/2.8 USM L II is the latest ultra-wide zoom lens made by Canon. Regarding its rather steep pricing of around 1400€/US$ it's primarily targeting the professional market segment. Compared to its predecessor Canon claims to have "improved the peripheral image quality at the wide-angle end". Certainly an interesting aspect regarding the rather mediocre full format performance of its little cousin (EF 17-40mm f/4L) here. Well, we'll see whether this statement survives our test procedure.
The build quality of this lens is basically identical to the EF 17-40mm f/4L - it's exceptionally high just as you would expect it from a Canon L lens. No wobbling whatsoever and smooth controls - almost perfect. The lens is also designed to survive in harsh conditions with a sealing against dust and moisture. The outer length of the lens remains constant although the inner lens tube moves a little according to the zoom setting. Needless to say - the front element does not rotate during focusing or zooming operations. Read the whole review here. You can buy the lens here.