I love Bluthners also. They are great artworks. Have u seen the walnut mahogony b4? The polished finish shines like marble. Very warm and broad tonal depth, but I feel that Bluthners are way too much over priced, esp. the uprights.
But they are famous for their 3 strings, instead of the usual 2 only.
But most reputable grands do have 3 in their higher/lower registers also. That's why they 'ring' so nicely.