Are
these the ones you like? I've seen them called "Karelian" style, after the Russo-Finnish Karelian culture, but I've seen enough variation to know you could probably write a book about the distinctions.
I was always tempted to spring for a Joonas. You're right, he got transitions so crisp and clean on his sheaths it looked like woodworking instead of leatherworking. He always did that sharp hook on the end of the lesta, too. It's been a while since I was hitting the nordiskaknivar blog on a regular basis, I may have to go check back in.
I've still got one of my self-handled Lauris, which I hope I'll never get rid of, and it's got that oh-so-satisfying *shnick* to it when you re-sheathe the blade.