‘Comprehensive’, ‘high ability’, ‘minimum effort’ etc are qualitative and entirely subjective. One associations high ability is another’s ‘meh’.In terms of martial arts, I see "master" having two connotations, one referring to his organizational status and the other to his ability. There is little for discussion in regard to his official status - It is documented, ipso facto based on a certain rank, and recognized, at least among his group.
In regard to ability, I would put forth the following criteria as required to be considered a "master" of the art:
1. Has full comprehensive knowledge of the principles, background and other foundational concepts.
2. Has an extremely high ability in the technical execution of the techniques fully utilizing #1's elements.
3. Is able to execute techniques with minimum effort and thought in a natural spontaneous manner.
4. Is able to apply techniques against others utilizing tactics and able to discern the tactics of others.
5. Is able to immediately adapt techniques to handle changing circumstances.
6. Is calm and courageous in the face of opposition.
There may be a couple of other qualities others may include, but, IMO, one who possesses all these elements can be called a master of his art. This list includes qualities that address the mind, body and spirit, the master being able to unify this triad to a high degree.
Let’s just use the art’s original word ‘shifu’, ‘sensei’ etc and not attempt translations into English as the meaning is clearly becomes distorted.