From the list of above:

Tier 1
Beijing, Shanghai, Guangzhou (add Shenzhen)

Tier 2 (Upper)
Nanjing, Tianjin, Hangzhou, Shenyang, Wuhan, Chengdu (add Dalian, Chongqing, Suzhou)

Tier 2 (Lower)
Changsha, Jinan, Zhengzhou, Hefei, Xian (add Qingdao, Xiamen, Wuxi, ++)

Tier 3 and above
Hohhot, Urumqi, Nanchang, Changchun, Fuzhou, Yinchuan, Taiyuan, Haikou, Lhasa, Kunming, Shijiazhuang, Lanzhou, Harbin, Guiyang, Chongqing, Xining, Nanning (++)