Just wondering, why did you add a 7 year old €300 Casio to this comparrison? You can not compare its sound quallity to the others, nor the upcomming mz-x
Here my verdict ... Based on the arrangements and not so much on the soundquallity..
1. Korg
2. Ketron
3. Yamaha
4. Roland
I like the Korg styles because they are thenones that will not get in the way of my performance.. Simple, versatile, witouth all the bells and whistles of the Yamaha styles...they do sound like a backinband..
The Roland still sounds like the good "old" G70, a bit dated..