The "High End German brands" use the same critical components (objective lens, sensor, display, processing electronics) as the non "high end" brands because zee Chermans don't make ANY of those bits
Anyone buying a Zeiss, leica or Swaro thermal is being ripped off - and it's people like you, who openly confess to knowing nothing about them ("what the hell are microns") who they are waiting for with open arms.
Cheers
Bruce