Kosho's existing masterpieces include the statue of Kuya Shonin (a collection of Rokuharamitsu-ji Temple), which is one of the most famous masterpieces of all image statues in Japan, and the statue of Kobo Daishi (a posthumous title of the priest Kukai) in Mieido hall of To-ji Temple, which became the model for the statues of Kobo Daishi in later years.
現存する康勝の作品としては、日本の肖像彫刻として屈指の著名作である空也上人像（六波羅蜜寺蔵）、後世の弘法大師像の規範となった東寺御影堂の弘法大師（空海）像などがある。