I don't disagree that the change of the DAC IC likely wouldn't change perceived sound quality, except your "Let your ears be the judge and not outside influences" is not only a controversial topic, but also contradictory. Judging by ears is actually one way to be subjected to outside influences such as by the eyes, and memories of reading all sorts of marketing material, forum talks, Youtuber reviews, print magazine reviews etc.

Regardless, congrats to your success in getting a 4700, that I assume would be a good deal since it was discontinued already.