Pacs made it the distance without being hurt against some of the big punchers he's fought. Khan has never made It through a fight against a puncher without being either badly hurt or knocked out. Pac is also smaller than Khan. no comparison in my mind, every time a shot lands on Khan I'm waiting to see if his legs have gone, can't say the same about Pac.
Not even close. Whilst Pac's chin isn't the best, Khan's is 100% triple AAA grade china made of a material as of yet understood to society. Would Pac have crumbled under punches from Limmond, Drilzane, Watson and Gomez? Where as I think we can all agree Khan would be KO'd by the likes of Marquez, Cotto, Hatton, Mosley etc... No comparison here.
