Sorry sparky. I like Roland best, but the BK-9 (at least the style creation engine) was fraught with software bugs, many of which I would guess were never resolved. Similar experience with another boutique brand. So I personally wouldn't pledge any money until after a hands-on test.
Yamaha is the most conservative, they rarely introduce new features. Because of this, there's no reason to upgrade from my T5 anytime soon. My $.02.
Many players enjoy the T4 better than T5 or Genos I recall reading..