There are a number of factors to consider when answering this. But briefly, we have today between four and twelve papyrus documents of the New Testament written within a century of its completion. Within 125 years, 43% of all verses are represented in the papyri. Over one hundred manuscripts still exist today that were written within 300 years of the completion of the New Testament. The manuscripts still in existence today that were written within 500 years of the completion of the New Testament weigh in at more than 250. And the NT text is multiplied many times over in these manuscripts.
How does this compare other ancient literature? The average Greco-Roman author has no literary remains within a half millennium of his writings. None! Or to put it another way, there are more than a dozen times as many NT manuscripts within 500 years of its writing as there are manuscripts written within 2000 years of the average Greco-Roman author. By any standard of comparison, the New Testament is better attested than anything from the ancient world. If we are skeptical about the wording of the original New Testament, we must be, on average, at least one thousand times more skeptical about the wording of any other ancient piece of literature.