Yeah, I have a KSC G18C and have played around extensively with a TM G17. I definitely like the TM better. The hopup design is MUCH better. I think only a couple of aesthetic points are topped by the KSC, such as the previously mentioned "Tokyo Marui, Made in Japan" and the base plates on the magazines.
The TM comes with night sights too! Bonus
I think the only reason I'd get another KSC glock would be for the 50 round mags, but I expect TM to remedy that soon enough (they made extended mags for the AEP already... come on GBB mags!)