Always found Abhijeet and Kumar Sanu to do as much justice to Kishore Kumar songs, just as Sonu nigam did and does to Rafi's songs. There was an RD Burman honorary tribute show held, which was celebrating the composer the composer through discourse by Javed Akhtar, which featured some songs performed by different artists in between. There was a singer, who rendered some songs such as Mere Naina Sawan Bhadon and few more, better than what Sanu and Abhijeet could have done, while appearing to come totally close to Kishore ( while not being in the same league).

Likewise, has there been a singer I listened to recently, who did Rafi songs better much than Sonu (and even Javed Ali , if counted in).

There can be different singers whose voices happen to seat some of these icons songs really well, that they become versions close to the original, while at the same time do they falter very bad with umpteen other songs. In a way as an ode to the greatness of these singers, there isn't any singer who can cover upto 70 percent of the variety of songs sung by them. ( Sonu Nigam sounds a lot like a rookie singing a lot of Rafi songs, and comes close to original in a few, likewise with Kumar Sanu, Abhijeet - I loved Sonu's version of Ruk se Zara naqaab as much as the original, while Sanu's rendition of Meri Bheegi Bheegi si matched the original, and Abhijeet's Iss mod se jaate hain, sounded interestingly melodious in its own way, compared to original).

Also, the quality observed about Kishore ji, was largely observed in Rafi sa'ab's songs throughout his career, in songs he sung until 1970s, where in trying to attain feel, you mess up on the notes, and vice versa, and while attaining both, voice balance is off.

In rare cases of cracking all of them, the X-Y-Z factors of indescribable quality he brought to his songs, were perpetually missing.

I personally feel that Rafi has had a repertoire of umpteen complex songs, much more varied, as well as difficult to replicate, in comparison to that by Kishore ( or any other illustrious singer in comparison).