It's a tough question. Sophocles was a real person, and wrote a greek lexicon a few years back (well, just a few):
https://www.logos.com/product/8513/e-a-sophocles-collection
NA28 on the other hand is NA27 plus 1. Not a man but a committee. Did they know more than Sophocles? How can we really know?
http://www.logos.com/product/29980/nestle-aland-greek-new-testament-28th-edition-with-critical-apparatus
Both are about 75% 'there' (one a CP; the other a pre-pub).
Hmmm ... Sophocles ... NA28 .... Sophocles ... NA28 ....
Why not BOTH?!