AZD - "Wire sharpness" was an expression certain PanF aficionados gave it regarding its particularly crisp edge effect, which significantly boosted its impression of sharpness with enlargement. It seems this is most pronounced using certain pyro developers like PMK. One of these days I should probably test Perceptol 1:3 as well, which successfully enhances TMX100 edge acutance. But with 4x5 film, we're on new territory with respect to PanF, since the degree of enlargement is typically going to be less than with 120 roll film.
So to answer your question - it is really both. The "wire sharpness" is both inherent to Pan F and should be apparent with any number of common developers. Yet, on the other hand, PMK pyro renders it particularly well, while, at the same time, improving highlight reproduction.
But dropping a hundred dollar bill for a box of 4x5 Pan F isn't on my list of priorities right now. That's two tanks of gas on a wished-for photo trip up the coast, or more likely, just one round of 8X10 C41 processing.