I am looking to have a UWA to complement my existing 24-105 and 70-200mmm lenses on a 5Dii. So I am looking at the 17-40mm f4 L.
Is there other lens I should be considering? The 16-3x (can't remember just now) f2.8 looks lovely, but the extra cost for one extra stop is a bit rich for my tastes.
Is there anything comparable or better from the Sigmas of this world?