Is sigma 19mm really better than the kit lens?

bnais wrote:

Sigma 19 owners usually say that it has better color and contrast than the 18-55, however I never saw a side by side comparison. In my opinion the kit lens isn't that bad and I like the versatility. Therefore probably I will stay with it. But the low price of the Sigmas makes me considering to buy at least one of them (19mm is more useful range for me).