Oppenheimer
Not my favorite Nolan film, but I think it's his best. Nolan has matured, displaying amazing direction and probably his most mind-blowing screenplay (yes, better than Inception, Interstellar, Memento, etc.), Cillian Murphy is heartbreakingly powerful, and Hoytema is at his usual best.
It did feel like three hours, but this is one of the best film experiences I've ever had.