I agree with Mike,
Here are some videos that people try to make a more realistic sound that they like using some effects.We also have plenty of them in our keyboards.
https://www.youtube.com/watch?v=biOWWsnN1BAhttps://www.youtube.com/watch?v=KBHE-B1zuZgor even the modulation wheel
https://www.youtube.com/watch?v=IICDRYdAEZ4Here another one has created his own piano sound from 130 samples(!!!) as he claims to get just a sound that he likes.
https://www.youtube.com/watch?v=4gsAyiD0n2gSome people except for effects like reverb,brightnes,release,attack etc like to combine a second piano or something else voice at a much much lower volume with the basic piano voice.
Let's be honest,do you believe a keyboard even of 4.000 euros can re-produce exactly the same sound of a 30.000 euros grand piano?
It's not just how good the samples are,but is also importand where the sound comes from
(from 2 speakers or the whole wooden "body" of a real piano?) and how the sound waves spread to the enviroment until the get to our ears.
Also digital pianos have better piano sounds than our keyboards.
That is why some people prefer those series instead of the keyboards series.