Sennheiser HD 800 S leads in raw audio fidelity with its 56mm Ring Radiator and 4 Hz-51 kHz range (per Sennheiser specs) while Logitech G Pro X 2 Lightspeed wins for gaming via 50-hour battery and detachable mic. Logitech at $249 delivers practical wireless features absent in the $1699 Sennheiser. The HD 800 S requires an amp due to 300 Ohm impedance unlike the Logitech's plug-and-play options.