I don't shoot super wide very often. The 70-200 range plus 28-75 tamron are on my 5D 80% time. The new lens will get occasionally use, although it would be nice if the focal range is flexible.
As I read on internet, the 17-40L seems to have two advantanges compared to the Tamron 1) better flair resistance 2) 5mm longer
The Tamron f/2.8 aperture at 17mm is nice, but not that important. Also it's said that it's a bit sharper in the center than 17-40L.
On the other hand, the Tamron can be had for less than half of the cost of 17-40L . Both used, the 17-35 costs around $300 CAD, while 17-40L normally is around $600~700 CAD range.
Anybody with experience with the two lenses. Your thoughts please?