Yohan Pamudji wrote in post #8664049
Somebody really said that? I could've told you they were wrong ahead of time

There was already a 17-85, so 15-85 with similar apertures wasn't much of a stretch, and there really needed to be an APS-C zoom lens with good range starting at 24mm equivalent so it made lots of sense. Now price-wise... $800 for an f/3.5 - f/5.6 zoom? Ouch. MSRP, but still.
Eh look at the current prices, its still a good $300 less than the other "pro-class" EF-S zoom, the 17-55...and i think that variable aperture is fine for what its intended for..
The Nikon 16-85 is $685 at Amazon right now with a normal price of $789[and I remember it was selling for this a few months ago, i believe Nikon is running a special], the Sony 16-80 Carl Zeiss is $750, the Olympus 12-60 SWM is $900
$800 for the Canon at launch "seems" high but its really in line with the competition...Especially if you stop to remember there are NO Sigma, Tokina or Tamron lenses offering this range and capability at all...I think the shock comes from that fact most Canon shooters do full frame around these parts, or they think in terms of "Crop = Cheap **** for Noobies" and that -every- lens above $500 must be constant aperture and have a red ring on it 
I'm not an expert in lens design, but I'm just gonna go ahead and say you're wrong about that. Call it a hunch. 15mm f/1.4 would be quite large, even with mere APS-C coverage.
Maybe..im really not sure, the only 15mm APS-C prime i know about is the Pentax one..and that one is pretty questionable in its utility [Its only f/4...and actually not much better than a zoom]