To cut a long story short: Arabic papyrology has next to no reference tools.
But because papyrology depends on comparing parallels in other texts, Arabic papyrologists have so far been reduced to making their own collections of rare words, formulas, idiomatic phrases, grammatical features, etc. This present state of Arabic papyrology – of a small group of scholars working individually with limited interaction – can be described as, compared to Greek papyrology, a structural delay of about one hundred years.
Extreme scepticism about the Islamic Authorised Version would seem to be eminently justifiable!
I think it is reasonable and logical to conclude the koran hadith etc are the equivalent of the Arthurian tales with added law etc.