This question is actually multifaceted, and cannot be properly answered in brief. The kedusha of an object is categorically different than the kedusha of a person, or a place, or a time. Being qualitatively different, we are unable to compare them at all. As for a person, the kedusha is completely bound to his madraigoh, which has nothing to do with his external appearance or impression. The kedusha of a simple person can be far greater than the known talmid chochom. Just that mortal man has no way to assess these things, and our discussion of such matters borders on what one sees when blind ch”v.
Some describe kedusha as the degree of connection between that person, object, etc. with HKB”H. The variables in those equations are many and beyond human comprehension. We all start off with a neshomoh that is a Cheilek Elokah Memaal. What we do with it matters much.