For more info and discussion about Sabian cymbals, look for the Sabian Thread. Or better yet, visit Sabian's website.
Regarding the cymbal lines, yes, Zildjian and Sabian do have their series counterparts. Both manufacturers have something special to offer. But it's still up to our ears to judge which sounds better and which are more appropriate for specific musical situations. In this case, beauty is at the ear of the beholder.
There are stories which say that Sabian was able to bring in a number of authentic Turkish cymbalsmiths when they were starting out. And these craftsmen were the ones who used to create the authentic Turkish K cymbals. So, some drummers believe that Sabian's hand-hammered line are the real deal, or the next best thing to Turkish K's.
Any more traces to this story? I read this somewhere online...