My recollection is that CFIT was involved in the King Air accident. So the single v's twin debate is sort of irrelevant there.
Ergonomics, and thus load factor (on the pilot) - with SA outcomes however, is very relevant. How do the King Air and PC12 compare on those grounds? Not much in it, I would have thought.
But I've never flown a PC12... Those I know who have, do speak highly of 'em.
CR.