You fellas will find that Waynorth is a leading authority of Harness Jacks. He's gotten a few of us paying attention to knives that many have forgotten over the years. Get one in your hands and you really appreciate the feeling of what a lot of us have come to refer as a "purposeful" knife.
I used to just think a punch was a punch. Thanks to Waynorth's influence I've had a chance to discover each punch design has its own charateristics, both in terms of original design and how it was produced, to how each design performs in leather. I've one that is very versatile in that it can make tiny holes to large, but the large take longer than say another design that just rips big holes fast, though those aren't always as nicely shaped. Then the above design, the Alvord, while not quite as fast as the big biter, makes a large hole only a little slower, but it is a nicer, neater hole.
Like I said, my experience is limited and recent, thanks to help on here. While I may never have a large collection of Harness Jacks, I've come to really appreciate a darn good pattern. Of the three different HJs I have, all designed and commissioned by a fellow forumite with a deep knowledge of the Harness Jack,

I've three different punch designs that cover quite a range of capabilities. Those three practically make up a leather working kit. Not much more to add for sheath and harness work, unless you want to get fancy with the tooling.