I was waiting and looking for ages for a fast, normal, aps-c prime. 28/1.8, 28/2.8, 35/2 and the sigma 30/1.4 didn't have the IQ or build quality, the 3 canons were all more than 15 years old, and expensive for what they were.
I ended up with the samyang 35/1.4, fastest-in-class aperture, zeiss-level IQ, and EF-s-zoom level pricetag. Not disappointed with it one bit. But i'd trade a bit of that iq, a slower aperture, and pay a bit more to get AF sometimes.
These 2 primes answer almost all of the problems with the other ones, assuming the IQ is as good as they say it will be, except for that huge pricetag. Owning a 7D, there's just more incentive to buy the EFs 17-55 f/2.8 for not much more than one of those primes.
But from a FF-owner's perspective, there's a lot more incentive when you consider the alternatives:
- 24-70 f/2.8. Zoom to more lengths, but no IS and a brick (and a damned expensive brick at that).
- 24-105 f/4 IS. More zoom, and IS, but only f/4.
- 24/1.4L. Faster aperture, softish corners, less than twice one of those new primes, no IS.
- and now 24/2.8 IS + 28/2.8 IS. Presumably decent IQ, looks nice and light (somewhere between 50/1.8 and 85/1.8 size).
Either would make a nice light hiking lens on a FF, don't even need a tripod with the IS on. Or a small/light/concealable street lens on a 550D.
But for a 7D owner who doesn't shoot much street, the EFs 17-55 IS just got more attractive...