I have found a difference between top of the line and mid line instruments of the same make..soundwise and quality wise..

My example ..Roland E80 verses the Roland E60...sound samples are larger and more detailed..also the output converters are better on high end models..

Sound systems ...make a world of difference..a great keyboard will sound like junk on a cheap sound system of poor design...and a cheap keyboard can sound great on a top notch sound system..

I'm glad I use a top keyboard and a great sound system.