Most of the cheaper lenses have IS. Probably because the Marketing Machine has led a lot of consumer to believe that lenses with IS are better than lenses without IS.
hmm let me think about this...
yeah they're better.
( can make taking pics easier in lots of situations = better )
I'll also take IS over f/2. Not a big deal on a 24mm lens.
then even less of a big deal for a non-L lens.
would you prefer a 24 f/2 non-IS non-L with probably harsh bokeh so that when (when!) you get OOF areas, they're also ugly? thanks but no thanks.
this is just about right. leave the f/2 for L glass. give the poor, marketing-indoctrinated consumers the 2.8 IS's.
we finally get cheap glass for FF. just great. finally!