Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. The driver size differs between the two (NA vs 45 mm), which can influence sound depth, bass response, and overall audio clarity. Impedance levels vary (300 Ohms vs 30 ohm), which can affect compatibility and audio output when used with different devices. From a usability standpoint, both models provide a reliable and premium headphone experience. There is a noticeable difference in weight (Approx 330 g vs 376 GM), which may affect comfort during extended use. If you're comparing Sennheiser HD 800 and Beyerdynamic DT 1990 PRO MKII, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The frequency response differs (6 Hz - 51000 Hz vs 5Hz - 40KHz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Both headphones offer strong performance, and the right choice depends on your priorities such as battery life, comfort, and noise cancellation.