I have a russian Mir MK-47 20mm/2.5 and SMCA 24/2.8 Between them, the second one is my clear choice (although for more than twice the money). It's a bit longer and a bit slower (or, maybe not, "2.5" is not necessarily "2.5" really). But it's a lot more compact, has half the weight, and there's simply no comparison in the build quality. Still, I was quite happy with the 20mm, until I got the 24mm. I am thinking of selling the russian one, since it has been collecting dust on my shelf for almost half a year already.
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