That depends what criteria you use to define who is "best". One criterium is the hi-scores, which you can access on the RuneScape site. Actually this is the only criterium that can be easily verified; the information for many other criteria (for example, who made the most money) is not publicly available.
The best runescape player to ever play is zezima and virgilio114 & sk8dude478 they are legends.
No, currently, telmomarques is the best player in Runescape.
No
If you mean the best player, what is your criterion for best player? If you mean the highest stats, look it up on Hiscores, which you can access from the main RuneScape page. The most well known player would be Zezima, who holds the record for the first person ever to have 99 of all stats.
Define "best"
The current second best player is: virgilio114.
King Duffy1
At the moment it is Gertjaars.
no. .
The best ( but most expensive ) has to be armadyl.
The best Runescape player in the world currently in 2009 is Gertjaars.
Personally i think its TehNoobShow but otherwise their is really no "best player" in runescaoe.