I'm with Pygmalion on this one. I have the same David E sheath, and it's the bees knees. Only difference is, mine has beefy hex bolts instead of phillips head screws. David makes the most ridiculously overbuilt kydex I've ever seen. He is a real craftsman.
I prefer kydex for smaller blades- just toss it in a pocket or a bag and you're ready to go. The Scrofa really belongs in Kydex, with that wickedly curved blade, it would be all too easy to tear up leather. I have my Scrofa at work with me now- it has replaced my beloved OJ warden as my EDC, at least until my Cultellus shows up. Where is that thing, anyway?