I'm not sure if this topic has been posted before, tried searching but didn't see anything, so please delete if it's a repeat; but anyway, which one?
I've read up a lot on the 30 f/1.4, and the core issue I see with it is bad copies are common, and the main issue is the AF being bad. So what I understand from this is, finding a good copy is like a needle in a haystack. I really want to get one, mostly due to the large 1.4 aperture, and if you get a good one photos are also really sharp.
The other one is the 28 f/1.8. I saw Ken Rockwell's review on the Sigma, and he said to just go straight to the 28 if you're a Canon shooter. The 28 sounds ok, and I'm shooting on a 40D so it would be around 44.8 on my camera, but I want something wider.
At the moment, I have a 50 f/1.8, which I am still highly satisfied with, and a Tamron 17-50 f/2.8 Non-VC. I'd love it if the 50 was less on my 40D, but of course that's not happening.
I picked up the Tamron a few weeks ago, thinking it would be enough to cure my desire for the Sigma or Canon, but after shooting around with it, I'm not that satisfied, due to my love for the large aperture capabilities after the 50.
I would appreciate any input, I am really leaning towards the Sigma, but the whole iffy AF issue is holding me back. If the 28 is also amazing from your perspectives, I may go towards it.
Either way, I'm trying to sell my Tamron right now, it just doesn't cut it for me, fast primes have taken over my mind...
Please let me know if you have experience with these lenses!