Was Himari beautiful? Yes! At least in the eyes of other people, Himari was very beautiful; however, in Hikaru's eyes, he just rated her beauty at about 87 points.
It wasn't that Hikaru was arrogant and that he looked down on others; rather, it was because he had already been surrounded with girls of a higher caliber like Vuni, Saraya, Anno, and Tsuraguki. And most males who look at them will think that they are angels.
Hikaru thought that if they were on Earth, people would worship them as goddesses of beauty. Hikaru was not exaggerating because even if someone used editing software to edit pictures, they would not be able to match the beauty that they possess.
