I own both the 740 and the Mz. I have posted a lengthy comparison on this forum if you are ineterested. It is at the bottom of this page or maybe on page 2 by now. The more I play the MZ and play around with morphing it's internal sounds, the more I like it. Although I still prefer some of the 740s styles , the ones on the MZ are growing on me as well, and I have successfully converted several of my favorite Yamaha styles for use on the MZ. Both of these boards are nice, but for me the MZ is the hands down winner.
Al M