http://www.thehindu.com/arts/music/article528270.ece
Some excerpts:
"Rafi bhaiya was not only India's greatest playback singer but also a wonderful person. I am yet to come across another artist so modest, dignified and unassuming. The blessings of Goddess Saraswati were with him and this was responsible to a great extent for his iconic success and he believed in true sadhna."
"He was one singer whose vocal range could outclass any other singer, whether it was me, Asha, Mannada or Kishore bhaiya."
"It is very wrong to say that Kishore Kumar overtook Rafi bhaiya in the early 1970s.Kishore was no doubt at his peak, but Rafi bhaiya was equally effective with Tere naam ka diwana, Gulabi aankhen, Yeh duniya yeh mehfil and Tum jo mil gaye ho. Even Kishore bhaiya never felt he was ahead of Rafi."