To my ears the bk-5 does not sound better it seem thiner in it sound the G70 I like the richer sound of the G70 seems scaled down in it sounds , Tyros 4 to my ears sounds Great not good for some sounds but works well with G70 , I am looking at PA3X 76 as a possable unit for me as well or MOX8 for a second Keyboard on stage for Piano and layers and useing Tyros 4 for solo and Sax ect . BK-5 is 1000.00 and worth that but to compair to higher units it will not.
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Genos, PSR S970, Fender Tele Amercian Deluxe Cherry sunburst , Cubase Pro 8 ,Yamaha A3M Acoustric ,Taylor 814, Ibenez Artcore Custom Tascam DP 32 Yamaha DXR 10, QSC K-12, K 12 Sub K 8 Sinn 945
2 Fender Expo line units .