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All Abrahamic religion received scriptures, and yet until the revelation of Quran, never has scriptures been so preserved without distortion. Both Jews & Christian Scriptures have long, lengthy verses where their sources are very doubtful. The uniqueness of Quran, is every previously said in the two past books is briefed and sort of in synopsis. We have to agree Quran has been preserved magnificently. The fact that there is great similarities of these three books should a raise a hair that the source is one: ONE GOD.
The Quran hasn't been preserved, there is textual variants in the current Qurans, abrogation meaning deleted verses, missing verses and even newly revealed manuscripts that contradict current Qurans.
Seems they have all been corrupted, and that is not even mention that they fail the burden proof, but that is a discussion beyond that which you requested.