Given the price tag of the 35mm f/2 IS, Canon will definitely be pricing a new 35mm L upwards of $1,700. Unless Canon makes it an f/1.2 or puts some major weather sealing on it...something to add additional value, it will still be a tough pill to swallow given how great the Sigma is shaping up to be. I'm worried about what Canon is doing to buyers that don't have funds to spend $1500+ on a prime. Putting IS in lenses has priced many people out of the new 24mm, 28mm, and now 35mm lenses...plus they are all slow for primes. If they do the same thing with the 50mm f/1.4, those with less funds may have no place to turn.