A glaring omission from your list is Steingraeber, which some now consider the best of all, as far as current output is concerned. Also the general opinion is that Bechstein is no longer in the top tier, Bluthner only intermittently so. Boesendorfer do now seem to be back on form after some years of very variable standards in the years immediately preceding the Yamaha takeover.
I saw a 1999 Schimmel sp182t for $14,500 USD (I live in USA).This piano is before their Konzert series and Classic series.I've played their Classic series and like them.However, I have no idea if Schimmel's reputation in Europe is considereda top tier German piano...you know, like an August Foerster or Gotrian, etc.or is Schimmel in the Kawai/Yamaha category (imo the Japanese pianos aregood pianos but not prestigious/highly-regarded).
I would say that there is Steinway, Bechstein, Bluthner, Bossendorfer, Fazioli and maybe August Foerster on the top, Schimmel is I believe group two in the value and prestige rating.