According to the Wikipedia article on the Quran, "It is widely regarded as the finest work in classical Arabic literature." The notes referenced at the end of this sentence in the article say that "Its outstanding literary merit should also be noted: it is by far, the finest work of Arabic prose in existence." and "It may be affirmed that within the literature of the Arabs, wide and fecund as it is both in poetry and in elevated prose, there is nothing to compare with it."
I am interested in knowing what literary works from pre-Islamic Arabia (that have survived to the present day) can be compared to the Quran to reach this conclusion. The names of the books and their authors would be helpful.