Well if we are comparing to this, I would say then Sonu did not deserve for this song as the original track is sung by Hariharan from Alaipayuthe, movie by Mani Ratnam which was later on made in Hindi with almost the same songs.
https://www.youtube.com/watch?v=uknl5lNwtnk
Now coming to Sonu vs Udit that year, I would disagree on both coz there were many regional songs that deserved it more.
However if you compare Udit and Sonu that year, then Mere Rang de Basanti deserved more than Udit's song
Sonu's rendition of saathiya is on some other level he owned saathiya and completely over shadowed hariharan rendition of South.. . Sonu got more depth, passion and romance to the song..... And Not every one is well versed with South songs till it get a version in hindi/urdu.. ..its recreation of rehman by himself ... ... Saathiya hold the separate entity for bollywood.... If South work is recreated by rehman and which become big than what it was in South the it says it all... And deserve all the recognition as rehman got worldwide popularity from bollywood versions.. Most of rehman bollywood songs are his recreation from his South work...
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