Jonty's probably the only guy better known for his fielding than other attributes of Cricket.
But Fielding ability is more subjective than batting or bowling ability.You have stats measuring the number of catches and runouts you've achieved, but you can't measure the number of runs you have saved in the field completely accurately.
I'm sure that for everyone who started watching cricket in the 1990s, Jonty was the prime example of world class fielding. But Cricket goes back a long way before the 1990s and the possibility of better fielders being around before him can't be discarded. Also, the game has become faster since Jonty's time with the rise of T20s and more ODI cricket, giving way to higher standards of fielding than ever before.
So,is he really the best the International game saw? Or is his ability on the field overhyped because he was the first 'fielding superstar' after TV made Cricket bigger than before?
PS. There might have been better cricket in First Class cricket who never made it to the International Scene, but for the sake of this thread, let's keep the discussion limited to fielders who played International cricket.