He has more flair in his passing, but I wouln't say he was a better passer than Barkley. They are the 2 that come to mind in relatively recent history.
I am telling you Webber is not the best passing big man, but he sure is one of the most intelligent big men .
The only chances I could see Sabonis play in his prime were some old USSR basketball footages. Anyways, seeing him passing the ball when he had become immobile was even more amazing. He's the only basketball player I have seen who could create for his teammates without moving his feet.