It's my personal view. He  is just a small kid and to sing this  kind of  complex song with this professionalism , I'll say that's superb. Way to go Sushant! We should  always encourage these  young talents! Who knows he will be most popular singer of Nepal one day. I don't think its easy to compare talents singerwise. Some people are good in classical, some in rock, some in hip hop, some in heavy metal.....so let's see how will he turn up when he grow up. My big hands to you!