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A 17-50mm is probably going to be lighter and more compact, it has a longer focal range and it's f2.8 and will probably be sharper too. However... the 17-40mm f4 is an L lens and for some that cancels out any advantage a non L has and L lust wins out.
There's nothing wrong with that, but IMVHO it's nothing to do with image quality or use. IMVHO 17-40mm use on crop bodies would plummet if it didn't have the L designation. Some people just want an L lens even if they'll never use a FF DSLR or 35mm SLR.
There's nothing wrong with that, but IMVHO it's nothing to do with image quality or use. IMVHO 17-40mm use on crop bodies would plummet if it didn't have the L designation. Some people just want an L lens even if they'll never use a FF DSLR or 35mm SLR.