My current keyb is the P-85. In terms of realistic piano key action. Is there a noticable upgrade in action with the P-125 and P-255? I see that the 125 has some felt on its keys (adjoining the unit) which the 85 does not, but I don't know if that affects the action any. The P-85's speaker sound is a total disgrace, and that is factor why I want to upgrade, but finding a digital piano with more realistic key action is the primary factor, though the P-85's action isn't terrible.