Any holster that puts the clip / belt loop on top of the holster/pistol is going to feel bulkier than designs like the CTAC which uses leather "struts" to put the clips off to the sides of the holster.
I had no interest in a hybrid (what everyone seems to call half-kydex or other polymer holsters that use a leather backer), but finally bought an MTAC since Comp-Tac wasn't offering the CTAC for the G43. Of course, days after I ordered the MTAC, they started offering the CTAC for the G43.
Because the leather is thicker than kydex, a hybrid holster will be thicker than an all kydex holster of similar design...but after the leather molds to your body, it's kind of nice.
If you really want to stay all-kydex and want it to carry as thin as possible, I recommend the CTAC.