Sennheiser HD 800 S excels in soundstage and resolution for home listening with its 56mm drivers and 4-51kHz range (per specs), while Sony WH-1000XM5 provides practical ANC and 30-hour battery for mobility at $399 MSRP. The $1300 price gap reflects their divergent designs: open-back wired vs closed wireless. Sennheiser wins for pure audio fidelity but loses on versatility.