Shakespeare’s sonnet 130 is a little different from many more popular sonnets and the summer day comparison –

My mistress' eyes are nothing like the sun;

My mistress' eyes are nothing like the sun;
Coral is far more red than her lips' red;
If snow be white, why then her breasts are dun;
If hairs be wires, black wires grow on her head.

I have seen roses damasked, red and white,
But no such roses see I in her cheeks;
And in some perfumes is there more delight
Than in the breath that from my mistress reeks.

I love to hear her speak, yet well I know
That music hath a far more pleasing sound;
I grant I never saw a goddess go;
My mistress, when she walks, treads on the ground.

   And yet, by heaven, I think my love as rare
   As any she belied with false compare.

William Shakespeare (1564 - 1616)

All aspects of her face are decried in in the first stanza. In the second stanza a case of body odour. And in the third stanza the decry of her voice. And it looks as though she could be flat footed. Not a pretty picture. However, Shakespeare does open with the first line of that stanza saying I love to hear her voice. The rhyming couplet states that despite all the comparisons in the aforementioned stanzas she is incomparable and rare. A unique being that he loves.

Why do we … compare ourselves with others … always look for ways to improve ourselves … are seldom happy with the way we are … always seeking perfection … perhaps subtle where change is gently mentioned … trying to improve relationships … on a reciprocal basis of course!

Well, despite such considerations when we look at those we love and those close to us, we are usually more caring. The great contrast in the rhyming couplet is to give acceptance of traits and shortcomings. In this poem they are highly valued. To the extent of showing incomparable appreciation to one very precious person.