I have searched high and wide for a leather-equivalent kydex OWB, including most of the outstanding holsters listed above, and still use leather exclusively for OWB carry. Kydex inside the belt, leather on it is what works for me.
I do have kydex OWBs for my main "shooting" pistols for range use, just to keep from soaking nice leather with my terribly caustic sweat. For that purpose I've been using JMCK OWB2s, mostly. Great holsters, but they don't hug as tight to my hip as comfortably as leather.