From amongst the most amazing of those who memorised [knowledge] in our time was Ibn Taymiyyah; He would read a book only once and it would be etched in his mind (i.e. he would have memorised it).
Whilst I would walk through the market of Baghdad, I could hear the sound of female singers from the rooms, so I would put my fingers in my ears.
I have never revised a hadeeth, and nor have I ever had any doubt in [the memorisation of] a hadeeth, except one hadeeth; and when I questioned my colleague about it, [I found] it was [exactly] as I had memorised [it].
Abu ‘Amr al-‘Alaa’s home was full of books. So when his house burnt down, all that we took from him (in terms of knowledge) thereafter until he died was from his memory
For 20 years I have not heard from any man who narrates hadeeth except that I know more about it than him.