It's hhEEEeeeerrreee!
Working from home today (as usual) so I'll report back on long term comfort.
First impressions - it's firm (as expected), it's mind buggeringly heavy and it's very adjustable. Lumbar support is good, seat base width is excellent (the Omega would have been too narrow for me) and the armrests work well. I can get the seat in under my desk and because the rests adjust fore and aft I can have them at the right height for me (level with the desk) and push them back so they don't foul (one of the main issues with my old chair which was a £700 office chair).