Check out the MTAC holsters. IWB, leather back, with a Kydex shell that's molded to fit G26/G27/G28/G33.
IIRC, the leather back also comes in "combat cut" or "regular cut", but I may be thinking of the Crossbreed or another one. (That kinda memory lapse happens a lot at my age.) Anyway, a regular cut set-up has a wide leather back that keeps the grip and slide away from your body. The combat cut only keeps the slide away. So... it's easier to grip quickly and solidly without the extra leather around the grip area.