The Kydex sheaths for Spyderco Temperance and Moran are about the best factory sheathes that I have seen. I am sure that the On Scene sheaths for the Foster Fear Survival Knife are right up there too.
I’m not all that familiar with the current crop of SOG sheathes except for the Seal Revolver, which has a decent Kydex sheath (not the greatest, but far from the worst).
- Frank