There are some fine details to both!
Awesome stuff about Grog's sheath:
1) nice dye-job

the color is really neat
2) the stitching on the front is so nice, as is the basket-weave and shell stamping. The fact that the stitch line on the back isn't perfect just adds character to the piece. And how the stamp wraps just that little bit around the fold of the sheath, how it keeps that nice even distance form the seam/stitching, and how it tops out right below where the wet-form starts to curve for the handle.
3) Oh that wet-form! The sheath owns the knife now.
4) the taper and stitch of the belt-loop. It goes on easy, evenly, and nothing inside to scratch at the knife.
5) the polished finish of the edge/seam/welt all the way to the sealed nose
6) the taper of the entire sheath - note how the profile narrows gently from mouth to tip. Man, do I ever appreciate that
Two weird things about Grog's sheath:
a) the waviness of the belt-loop - I guess you'd have to end up with something like that since you wet-form it after the loop is sewn down, so the loop gets clamped too

b) the top of the welt at the mouth of the sheath is just squared-off with a gap there
Riz's sheath:
1) Simple. I asked each of these guys for a simple fold-over leather pouch-sheath, black or brown. Grog went crazy and basket-weaved and dyed and ... While Riz stuck to the basics and delivered

2) It's close, but Riz's stitching on the back is straighter than Grogs

The guy posted pics of a leather sheath with those nice straight stitches and the border cut around them - THAT was why i asked him to make me a sheath. Looks good, doesn't it?

3) Riz's belt-loop is fine - I actually prefer the width on his to Grogs for its stiffness, and the 'stripe' stitching is again excellent. You can't see the glue when I'm wearing it

4) No wet-form on this one which, while less amazing than Grogs, means that I may use this sheath for my 4.1 when it arrives! In fact, I'm going to start trying out all my knives in this size... However, the sheath fits nice and tight, no wiggle and the knife isn't sliding out without my meaning for it to.
5) the seam, while not as refined as Grog's, is well rounded and tight, and ends with a drainage-hole at the tip (more practical, really, than a sealed tip) but what is really nice is the shape of the welt at the mouth! It may not be obvious to folk, but the welt, which starts right at the mouth of the sheath, is tapered to guide the knife handle in. Grog, you should take lessons from Riz on that one

6) Not that you can tell from those photos, but the knife in the Rizzo sheath was sharper when it got back to me, and I definitely sent it out dull... just sayin'
Now that the forum re-vamp is mostly done with, I hope some folk find time to drop in with more pics of leather sheaths, esp. on S!K blades. And I gotta get back to work

Here's to two awesome sheath makers!