I value sheepsfoot/wharncliffe/k-tip inspired blades for their tip control when piercing softer material and digging into various material. The straighter edge does not "push" material away from the cut, as do knives with greater edge curvature. They are easier to freehand sharpen and make great practice pieces for advancing free hand skills.
It also interests me, that these designs have transcended various cultures - parangs, goloks in Asiatic areas; Santokus, Gyutos, Kiritsukis, and Honesukis from Japan. Some Seax style blades out of N. Europe share parallels with this topic. I hypothisize that these blade shapes were not only useful in funtional aspects, but easier to forge and grind into shape in the days before modern metal working tools appeared.
I do agree with other posters that a slight bit of each curvature up to the tip is beneficial in use, but I still like purely straight edged wharncliffes and sheepsfoot styles.
Some K-tip examples:
Gyuotos, Santokus, Kiritsukis:
Various sheepsfoot interpretations:
Parangs, Goloks, and an odd cleaver santoku heavy chopper at the bottom
Recently started to have interest in folding knives from Spyderco, so had to pick up this Dragonfly variant.
Some Seax pattern interpretations: