i personally feel parleen is a outstanding performer and above average singer but his voice quality is not so pristineand clear .........i still feel his voice goes heavy nasal sometimes but doesn't sound nasal ........it kind of resonates before reaching nose...........
chang's voice quality is little better compared to parleen...........prashant has great voice quality but he is a bad singer may be cause he is not trained ..........
anyway abhishek is overall good singer and amit and emon are best...........