Good Boston grand piano!
Japanese Yamaha kawaii has a very bright tone and a very light feel. The Boston belongs to the Steinway family series. The sound is clean and transparent. The Boston is definitely more cost-effective.
Boston is a high-end brand owned by Steinway and has 33 world patents from Steinway. The original movement of the Japanese piano is made of carbon fiber, which is a kind of plastic. The difference from the German piano is the material. The German piano is made of solid wood. Japan has to use plastic because it has no wood, but the instrument must use that wood. . And it has to be solid wood.