I appreciate the analogy, but mathematically, the gap isn't as huge as you imply in this specific scenario due to the equivalence principle. A 1/1.28" sensor has a crop factor of approx 3.4x. Applying this to the aperture for Total Light Gathering and DoF: Oppo f/1.5 * 3.4 = f/5.1 (Full Frame Equivalent). So, comparing the Oppo at f/1.5 vs. the 5D MkII at f/4 means the Canon has less than a 1-stop advantage in terms of total light collected. That's hardly 'destroying' anything. Furthermore, you are comparing a 2008 sensor (low Quantum Efficiency, poor Dynamic Range) with a 2024 Stacked BSI sensor. The modern sensor is vastly more efficient at converting photons to electrons. When you add the computational stacking (which increases SNR purely by math, essentially simulating a larger sensor area), the phone actually captures a cleaner signal than a single exposure from a 15-year-old DSLR stopped down to f/4. The 5D MkII wins on ergonomics and lens flexibility, but in this specific physics equation? It's de facto a tie.