With such tunes, there is hardly any difference in the piano sounds. It might become more evident if a classical piano tune was played involving all the different dynamics - which is difficult to do with a semi-weighted keyboard. Nowadays, 10 times as much waveROM for a specific sound only leads to nuances of perceived gain in realism, whereas in the early 90s 10 times the waveROM was a massive improvement. A typical "degressive growth utility function".