Originally posted by stevebrot Good question...the nearest I am aware of by spec would be the FA* 24/2.0. It is 20mm shorter, 10mm smaller at the filter ring, and 80g lighter than the Sigma. The AF version of the Sigma 24/2.8 Superwide is quite a bit smaller, though your point is well-made; both 24mm and 20mm were rather specialized focal lengths until fairly recently and entries into that space, particularly AF are a rarity.
Addendum: In a fantasy encounter, if I were ever to find both lenses in the case at Goodwill for $100, I would likely buy the Sigma, mostly because I like the EX DG look and feel over the plasticey look of the FA*. OTOH...Heck, for $100 I would buy both and let them duke it for supremacy on the closet shelf for the entertainment of the other lenses (fantasy, remember).
Steve
for $100, yeah, I'd take both and see which one tickled the itch and probably sell the other....
the Superwide AF had been on my 'watch' list for quite a while and I missed several before landing on the EX DG - I still see them come up occasionally and have to catch myself from reacting...
btw - none of the EX DG's are svelte: