Who is Niu Yi, Wang Xizhi and Qi Gong?

What does this need to compare with, calligraphy? As for calligraphy, there is no comparability. In the Republic of China, with so many talents, qigong can only be considered as an average level. In this era of no need to brush, it is really rare. Qigong is better than calligraphy in learning and is a master of Chinese studies. But in terms of knowledge, ancient Wang Xizhi is not worse than Qigong, so there is still no comparability.