photozone has completed their review of the Canon EF 11-24mm f/4L, the worlds widest lens for full frame DSLRs. This is probably the first review I've seen for the lens that isn't completely positive and points out some real world weaknesses. While it's a unique and excellent performer, photozone did find their share of faults.
From photozone:
The center quality is nothing short of outstanding straight from f/4 and throughout the focal length range. However, the outer image region isn't all that hot at 11mm and especially at max. aperture and the high level of lateral CAs doesn't help either here. Moving on the 14mm and 18mm the results are much improved with good results even in the extreme corners. And let's be honest – most will use the middle range more often than the extremes on this specific lens. A decent scene composition is already very difficult at 14mm or 18mm and you will need to get used to having 11mm at hand as a new option really. The 24mm setting is a bit worse again but it remains quite good when stopped down a bit… Read the full review
Canon EF 11-24mm f/4L USM $2999: Adorama | B&H Photo | Amazon