The KS started it all, and a couple years ago the KS was a very hot item on the forums. Then other makers caught on and made their own version the the KS.
Here are just some:Sakai Yusuke, Ashi GINGA, Moritaka, konosuke fuji (to some extent), the-site-that-can't-be-named Ultimatum. Not sure where the Tesshu stands.
They all have there very own take on the KS, so they might be worth a look. But I will leave that to the others with experience with the said knives.
Can you elaborate a bit on what it is the KS started and the other makers copies? The profile, the cross-sectional geometry, the grind, something else?