I hope everybody can see that this is not a sound argument. In regard to a woman one cannot draw conclusions about her virtue or her knowledge from the property of beauty. Neither is there any logical connection between eloquence and divine origin. But even if there were such a connection, there is no established standard according to which we can judge. Beauty of women is just as much subject to taste as is beauty in literature.
Different people have different likings.
Some people find the Qur'an to be eloquent and some don't. But the most important comparison between the beauty of a woman praised by her husband and the appreciation and admiration for the Qur'an expressed by a believer is the following. If a man is truly in love with his wife, he will be totally convinced that she is the most beautiful woman on the earth even if nobody else sees this. It is a question of his relationship to her, and not a question of his ability to judge objectively. For a husband to praise and prefer his wife above all other women is right and proper and will only have positive consequences.