I’ve never been able to get the hype on Sennheiser. My Sony noise cancelling Bluetooth headphones blow everything else away I’ve ever tried. Even with a DAC (tried two). Sold all my audio gear, no more spider web of Schitt or Focusright gear.
The HD800 are the best pair of headphones I have ever owned. Incredible soundstage and imaging. They are probably the best anyone could ever do with dynamic drivers. I have a lot of music that I save for these headphones, never wanting to play on the go via Bluetooth. My HD600 are still going strong (having been purchased in the early 90s), thanks to a quality product and availability of spare parts. Sennheiser are a fantastic company and I hope they keep making headphones.