As of the selected ranking year, Cher and Keira Knightley form a comparison shaped more by career pattern than by any single credit. Commercial scale is another meaningful divider, with the career domestic box office measure giving Keira Knightley the larger theatrical footprint.

The biggest-hit category sharpens the box office contrast, especially because Keira Knightley's leading film creates the stronger single-release benchmark. Overall, the head-to-head score leans leans toward Keira Knightley, but the strongest context comes from the categories where the gap is clearest.