Actually that depends on who you ask, but if the person you ask is Marv Dunphy, the answer will go something like this…
“If we were on the plane to go to the Olympics, and they were just about to shut the door, and Karch Kiraly called me to say that he wanted to play, I would stop them shutting the door until he could get to the plane. Then I would cut someone, and Karch would be a starter. He was that good.”
I have heard versions of this story before, from a variety of different origins, but this one was attributed to Dunphy about 8 or 9 years ago and reported on TheNetLive.
If you ask many Italians many they would say Lorenzo Bernardi, as he was named with Karch the Co-Best Player of the 20th Century by FIVB. Recently I had a chance to ask someone who knew players who had actually played with both of them. The story goes that among players who have played with both… Karch is still the best.