You have a 7 band EQ inside the PX5S!
The Grand sound is the best, I have two Hamburg Steinway D I can play every day, also a Kawai CA98 and I owned a Nord Piano, Roland RD 2000, Kawai CS10, MP11SE, Korg Kronos, Yamaha P100, 150, 200, 250, 515, a Dexibell expander and a Korg Grandstage. And some I forgot.
Guess what sounds the best compared two those Steinways?
Yes! Please learn how to tweak the sounds and download the various altered grands on the download site ( I made a few myself, for my taste)
Buy yourself a good headphone Beyer 880 or Sennheiser 650, and good monitors: Presonus Eris 5 for example (they don´t have that dead mids)!!!!!!!!!