I have a Tyros 3 and from this video IMHO the difference in sound is marginal. Now I am sure there are other advances in the 5 but from an overall sound quality perspective the difference is not significant. Also while the SA and SA2 acoustic voices are fantastic in the Tyros the Style Sound is too processed as some say similar to listening to a CD. I have to really play around with the styles to get them to sound better. I find the Korg Style Sound, and even Roland's and Ketron, much more life-like.