Comparing how many tests Warne and Murali has played to how many wickets they have taken does not give an accurate description of who is better. Warne takes a wicket every 60.3 balls, Murali takes a wicket every 59.3 balls. Warne has bowled about 130 more overs than Murali in 22 more tests. Murali bowls a lot more overs per test, therefore more chance of getting wickets. You also have to take into consideration how much Murali gets to bowl on more spin firendly wickets than Warne.
Now about Sachin being a lot better than Hayden. We can start with the fact that Hayden has an average of 1.72 more than Tendulkar a game, Dravid also has a better average than Tendulkar. Tendulkar gets a century 5.625 innings compared with Hayden who gets a century every 4.88 innings.
Thats my fun with using stats to try and argue a point, of course I used stats that would help argue against sachin, I'm sure he could use plenty that support he's opinions. Because really it all comes down to opinion to who people think is the best player.