I'm not sure what all your "zombie knives" label encompasses, but the Ka-bar ones are certainly fine, fully functional blades. They're made in 1095 Cro-Van(older models in SK-5, either is a fine blade steel for what are basically big camp knives), full tang, with your basic polymer handle(they all come with additional black scales, if you dislike the "toxic green" ones), and a functional(albeit somewhat bulky) sheath(complete with a small skeletonized fixed blade). If you took a "zombie killer" knife like the Ka-bar War Sword, Famine Tanto, or Pestilence Chopper, ditched the "zombie" label, sold them with just the black scales on and called them say, the Ka-Bar Combat Bolo, Heavy Tanto, and Billhook Chopper, not one person would question their quality as knives.
Oh, and yeah, I have the Pestilence Chopper, War Sword, and the Chop Stick. One of these days I'll pick up a Swabbie but I haven't got to it yet. So many knives, so little time(and money)...