The EU-China Comprehensive Agreement on Investment (CAI) features limited substantive `traditional' guarantees for foreign investors but contains original liberal-ization commitments that go beyond the otherwise common `admission' promise, or the less common `establishment' commitment, to regulate `market access' -a unicorn in the field. By focusing on this aspect, the analysis makes reference to a) the current legal and policy framework of both EU and China, b) their respective international investment agreement (IIA) policies, and c) the bilateral investment treaties between China and EU member States. The CAI reveals a sui generis character as, in addition to its novel focus, it consolidates the EU tendency to drawing from other fields, including trade law, environmental law, labour law, sustainable development, and public inter-national law. Considering CAI's departure from established models, and its specific scope and context, the agreement may not contribute significantly to the development of the design and evolution of substantive rights afforded to foreign investors in IIAs.