This study focuses on doctoral students' professionalisation as future academics across academic disciplines, using a Hong Kong research-oriented university as a case study. Doctoral students acquire the norms, knowledge/skills, and values required for the academic profession through their learning experiences. The study aims to explore how doctoral students perceive their professional competences and what are the major factors of learning experiences influencing perceived competencies among them. Data collection of the study is based on a questionnaire designed by international team members in a previous project entitled "A Comparative Study of Doctoral Education in Asian Flagship Universities." Drawing on data from 490 respondents in Hong Kong, the current study uses descriptive and regression analyses to examine and compare the factors influencing doctoral students' perceived competencies in terms of tasks, ideas and attitudes. The results show that the competencies of doctoral students are influenced by various factors, such as curricula, supervision style and learning culture. Overall, the study suggests that the formal and informal learning experiences of doctoral students must be carefully designed and implemented to foster the development of their professional knowledge, skills and values.