مَا فَازَ إِلَّا خَالِدٌ.
No one won except Khālid.
Negation plus exception restricts the winning to Khālid. It asserts more than “Khālid won,” since it also excludes all others within the relevant group.
The restricted domain must be supplied by context: everyone present, or only contestants in a particular competition? The form should not be interpreted as unrestricted across all conceivable people.