if you are comparing with classical gayeki then suresh wadkar is far ahead of sonu nigam.he isn't best next to rafi.kishor and rafi are the best.
M rafi is a God of singing and to sonu he is a guru and ustad . But like i earlier said what greatness kishore kumar posses???? He was a very ordinary singer simply overrated . He never sang songs of differrnt genre like rafi sahab did . he dont have a single classical song with harqat and murkiyaan which can actually shows his potential of singing ... A song " Nafrat ke hai duniya" kishore left this song as he was not able to sing it he accepted his defeat dat he cant sing this song like rafi sahab :) and Sonu Nigam is far ahead in term of Classical gayekii and vocal range then kishore kumar ... Kishore just had couple of great songs he wasnt trained in classical singing so his minus point is he cant be compared to artist who know classical gayeki
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