Be without equal
Definition 1 of 1
Pro Tip 1/3Comparative Excellence
Use when nothing else compares in excellence or quality in a specific category. 
Among smartphone cameras, this model's features are without equal.
Pro Tip 2/3Unique Superiority
Implies that the subject possesses a unique characteristic that puts it above the rest. 
His understanding of ancient languages is without equal.
Pro Tip 3/3No Rival
Suggests that there is no competition or rival that can match the subject. 
As a war strategist, she is without equal.