Actually, the more I think about it, the quality that makes a gun look the best is when it goes bang every time you pull the trigger with the intention of making it go bang.
Beauty is in the eye of the beholder. I think all my guns are beautiful (especially the CZ P01). I think my dad's 1916 built 1911 is more beautiful than anything I own, but there are folks here who will argue that everything I own is fugly.
Nobody can reasonably argue that my dad's 1911 ISN'T beautiful, that would just be crazy talk!