Quote Originally Posted by M_Six View Post
I own both and I agree absolutely. The 50mm F1.4 is far sharper.
Which confirms what Daniel said if (if I understand all this correctly):
If you look for a normal focal length prime (50ish FF equivalent), you have a lot of options on a FF camera, but on aps-c you have the Sigma 30, or older EF lenses that don't perform well on the aps-c sensors with their smaller pixels. The new EF 28 should be much better even on aps-c, but it is not available yet and will be more expensive.

Looks like the Sigma is the best option if you get a copy that focuses well on your particular body.

Arnt