> I wonder if the (there must) exists a study comparing ancient quotations
> of Homer to the standard manuscripts from the Middle Age?
The Wild papyri of Homer are available on your screen via The Center for Hellenic Studies at:
For the standard editions of those known in 1967 see:
The Ptolemaic papyri of Homer / edited by Stephanie West
Köln: Westdeutscher Verlag; Opladen, (1967)
(Papyrologica Coloniensia ; v. 3)