To me, it's really very simple. Classic lenses are the "Oldie Goldies." You know, the favorites. Like an Ella Fitzgerald record. Stokowski conducting Tchaikovsky Symphony number 5. Renoir's "Little Girl with a Watering Can." Dega's "Little Dancer Aged 14." The Leitz 3.5 Elmar. Carl Zeiss Planar.
May the light be with you.