Canon 35mm f/2

[M_Six]

Dave,

if you consider a 35mm on APS-C but change to FF instead, you would need a 50mm instead for a similar FOV. I think the 50mm f/1.4 performs better than the 35 f/2

Arnt

I own both and I agree absolutely. The 50mm F1.4 is far sharper.

[ahab1372]

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