This study investigates the role of ESG-driven innovation as a strategic source of competitive advantage in the banking sector, with a comparative focus on state-owned and private banks across emerging and developed markets. Drawing on the Resource-Based View and Dynamic Capabilities theory, it develops a novel ESG Innovation Index that captures the depth and integration of sustainability technologies, such as AI-based ESG analytics, carbon tracking platforms, and digital reporting systems into core banking functions. Using a panel dataset of 68 banks from Central Asia and benchmark economies (2015–2024), the study employs fixed-effects and system GMM models to assess the impact of ESG innovation on profitability (ROA, ROE), operational efficiency, market share, and investor attractiveness. Results reveal that ESG innovation significantly enhances financial and operational performance, while the magnitude of its impact is substantially higher among private banks. The findings highlight that ownership structure moderates the innovation–performance nexus, with private banks leveraging technological agility for greater returns, whereas state-owned banks tend to pursue compliance-oriented sustainability agendas. The research contributes to strategic management and sustainable finance literature by framing ESG innovation as a contingent dynamic capability and offers policy insights for regulators seeking to balance innovation incentives across ownership types.