A Leander frigate under the air attack faced by Ning Hai

How would a Leander-class frigate fare against the air attacks faced by Ning Hai?

Probably somewhat better, especially while maneuvering as part of a task force rather than fighting alone.

A Leander-class frigate would probably withstand the air attack somewhat better than the Chinese cruiser Ning Hai did. The comparison cannot be reduced to the two ships' individual armament or protection. A Leander was meant to maneuver at sea within a larger task force whose ships supported one another. Its likely survival therefore depends on formation tactics and collective air defence as well as the frigate itself.