DisplayMate Technologies has extensively tested the Apple Watch's flexible OLED display and shared the results today based on several categories, including screen reflection, brightness and contrast with ambient light, color gamut with ambient light, and viewing angle variations. Overall, the company found the Apple Watch to have an "excellent smart watch display" with accurate colors and picture quality.
"Since the Apple Watch is often used right next to the iPhone 6, Apple has gone to considerable lengths to give them the same colors, color calibration, and color accuracy. The two most significant differences (other than size) are the much higher Reflectance of the Apple Watch with a sapphire crystal (8.2 percent compared to 4.6 percent), and the aggressive Brightness control using a mandatory Automatic Brightness Ambient Light Sensor in order to increase the running time on battery for the tiny watch."
Article Link: Apple Watch Display Quality Judged 'Excellent', Calibrated to Match iPhone 6