I've never owned a Sigma lens, so I'm not sure if excitement is the word that jumps to my mind. Curiosity is probably more accurate. In my mind, the Sigma lenses don't necessarily outperform L lenses, they are just less expensive. So, if Sigma comes out with a lens of equal optical quality to an L lens for 2/3 the price, in my mind, its like having a 30% off sale on L lenses. Now, if they outperform, for 2/3 the price, I'm there!