I’m sort of confused by your post. The utility knife or exacto blades are more examples of a wharncliffe than a sheepsfoot. While I’m not entirely sure when a blade style changes from sheepsfoot to wharncliffe, I always thought that the wharncliffe was when the tip of the blade was more pointed and angular, while the sheepsfoot was more rounded and basically blunt. I certainly wouldn’t mind someone clarifying this for me. Good examples are the Spyderco Rescue (sheepsfoot), and the Spyderco Ronin or Yojimbo (wharncliffe).
There are some tactical designs for the Wharncliffe design. Spyderco’s discontinued Ronin, and Yojimbo can still be found. Benchmade produced the Snoody Gravitator, and the Juju, both of which are discontinued. There is also a Smith & Wesson HRT fixed blade that is a wharncliffe. CRKT also makes the Dragoon. I’m sure there are others, but I’m not familiar with them.
As for a tactical sheepsfoot, Spyderco has just recently released the Rescue with the patented Emerson Wave feature. They also made the D’allara Rescue which has been discontinued for some time now. Some people think that the D’allara Rescue makes a good SD knife since it is very heavy duty and has a solid lock.
I personally like the Wharncliffe, and carry one occasionally. I have two Yojimbo’s and one Ronin. If I could get more, I would. But they are hard to find, and expensive due to collector value.
If your really want Yojimbo or Ronin, you might get Mike Snody to make one for you. Pretty sure he still makes the Ronin.
Both blade shapes will provide a good slashing due to the ability of the straight blade to stay on the cutting medium. I suppose that's why people like them for SD. The Ronin and Yojimbo have superior piercing capability with their needle like tip.
P.S.
You might check out this article.
http://www.martialbladeconcepts.com/ronin.htm