Ron Carter has, IMHO, what all great jazz musicians aspire to: an individualized and unique "sound". You can usually tell its him in just a few notes. Just like any other instrument, it's that unique "sound" that sets the great bassists like Ray Brown, Oscar Pettiford, Mingus, Scott LaFaro, Eddie Gomez, Paul Chambers, Doug Watkins and so many others apart.
My biggest problem with some of the younger bassists today IMO, like for example Christain McBride, is that they all sound like Ray Brown and if I want to hear some Ray, well, I'll go right to the source...
Then, of course, Christian McBride is young and still has time to "find' his own sound.