One of these comparisons again from which you can never draw any clear conclusions. In the first swing comparison, the player uses a nice Yamaha style and a not-so-nice Roland style. In case anyone believes The BK-9 cannot do better on swing based on this one style variation in this video, well... Then he uses a nice sounding harmonizer for the vibraphone - which he doesn't do in the Roland version. For Yamaha he plays a nice alto sax - why soprano sax for BK-9 instead? In this way you can create any comparative result you want, it doesn't say anything about which instrument is better.