Interesting. Not conclusive though.
I don't really know any other book that challenges the public to produce a match, so I can't answer your question. teh Bible has had greater wordwide impact than the Quran, I'm not sure it was unmatched seeing that they had to gather a couple of years long council on which books to include.. Perhaps the psalms or other poetic parts of the OT are unmatchable. Or the revelation, I don't think there have been other versions of Revelation other than the one in the canon.
Well, you said it yourself, absense of proof is not proof of absence.