Reading the wiki, it seems this term could apply to many people. I guess it's a nicer term than shyness/skittishness. It'd be hard to test since I doubt the average "sensitivity" is known, and probably many people would like to see themselves as more sensitive than the norm, so I suspect the accuracy is low.
My INFP mom says she's HSP, but she self-diagnoses as a lot of things, I've stopped paying attention. Reading the description though, it does sound like her (and me for that matter). Probably correlates with I and F especially, though not exclusively. Sounds like a very NF term, though, and I've heard more INFPs talking about it than any other type whenever the topic is brought up.
Most of the people I know that are HSPs are F types. But that's just the people I know though.
I would agree with that in general, although I have a ESFP close friend who's daughter is an ESTP, and she's very sensitive. Not emotionally, but physically. Seemed like the poor girl was constantly having allergic reactions to things, or being overwhelmed by situations where there was a great deal of sensory imput.
"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray
I am not an HSP, but I do understand the distinction and personally know a couple people who I'd consider HSPs. My mind tends to make judicious use of the squelch knob for most intense things (sensory or emotional); in fact I often feel I'm too desensitized to a lot of things, and that makes me feel bored/dumb at times.