These details can help me narrow down which model better fits your needs. Kawai GX: Evolutionary or Revolutionary? - Piano Buyer

Both pianos are known for a warmer, more "mellow" tone compared to their Yamaha counterparts, but the GX-2 offers a more robust foundation.

Ask any piano technician about the RX-2, and they will mention one flaw: the .

For a classical pianist, the adjustable duplex is a godsend. For a jazz player, you might disable it for a purer fundamental. The RX-2 gives you no choice.