The 14-24 is a large and heavy lens considering it's focal lenght but the image quality is astounding. I have not tested at the wide end but just yesterday did some comparison to a mint 24 AIs and a 24-85 3.5 - 4.5 at 24mm.
The 24 Ais is as far as i know the best 24mm prime lens but at f8 or f11 is does not even get close to the 14-24 at 2.8 in the corners. The 24 Ais never really do get sharp in the corner. Same for the 24-85
The weight really is not a problem, a 35 digital camera kit with a few heavy zoom lenses are still light weight compared to an 8x10 kit.
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