match14 said:
If an EF-S prime is coming then it should be a 30mm f/1.4
not a 35mm f1.8
An f/1.4 lens would be quite a bit more expensive than an f/1.8 lens: compare the Sigma 30mm f/1.4 to the Nikkor 35mm f/1.8 (O.K. the Sigma has better build quality as well).
Canon should be aiming for the $185 price point of the Nikkor rather than the $440 price point of the Sigma. A Canon EF-S 35mm should be a 'no brainer', i.e. if you want a normal prime, you'll buy it on the spot. At $185 most would be willing to give it a punt, but $440 will always beg the question "but do I really need it?"