The Seven Masters of Quanzhen were the seven students of Central Divinity Wang Chongyang.
The seven masters all had a strong internal power base that was above average during their era. This was due to the Quanzhen Internal Cultivation techniques, which had no limits and would even increase during your sleep. The seven masters knew most of the Quanzhen arts such as the Quanzhen palm styles and sword techniques.
Their best skill however was The Big Dipper Formation. When used by the seven masters, the formation was powerful enough to eventually subdue even a Great-level fighter.
While the seven masters were all very capable martial artists, there weren't too many prominent fighters to come out of their disciples.
Yin Zhiping was the disciple of Qiu Chuji and the strongest of the third generation in The Legend of the Condor Heroes, his martial arts ability would fall behind later on however, due to his focus on Taoist enlightenment rather than martial arts.
Guo Jing was an unofficial disciple of the Quanzhen sect, having learned Quanzhen's internal cultivation techniques from Ma Yu for two years, and later also receive instruction from Wang Chuyi. He would however, later become one of the strongest fighters of his generation due to his mastery of the Jiu Yin Zhen Jing and the 18 Dragon Subduing Palms.