Quote Originally Posted by 2F/2F View Post
I think zooms are most useful when you are stuck in one spot; when you are free to roam, their biggest advantage is lost. And you pay with size and weight (and expense, if they are a very good quality zoom, which one needs to come close to the quality of even the fixed-length lenses that are not necessarily high-end glass). Wide zooms are often an exception, as they are not too huge or too heavy. However, they are still larger than fixed-length wide, and good ones are expensive. They are also not available in very fast versions (f/2.8 is as fast as they get TMK), and I think fixed-length wides are generally optically superior. Having something small, light, fast, cheap, and simple trumps the ability to change focal lengths on the fly IMHO.
Sigma 12-24mm is SEVERAL leagues better than any wide prime lens. Had a look at the distortion tests, and all the primes in that league are terrible.

Having a zoom when you're not stuck is great though too, because you can move around, it allows you to alter perspective easily.