Zappa,
That's fair enough in that there's no telling, unless we are the original owners, what background any of these have endured. I have had my 2 pair of KLF-30 side-by-side driven by the same amp (Onkyo M504) and have done the same with my 2 pair of Chorus II.
It's all subjective in that what's clear and crisp to one is harsh or bright to someone else; what's great bass to one is too tubby to another. I want a little more bass from Heresy, others find them perfect.