Thanks, Tony & Mike.

I should add that many other sounds like electric guitars, saxophones, ethnic sounds etc. are overall on a comparable level in BK-9 and BK-7m. The only real weaknesses I see in the BK-7m are strings and acoustic guitars. The BK-9 offers some highlights, but of course, these don't go beyond what I already had with the Integra.
The overall package of the BK-9 is really quite appealing, in my case the crucial point to try to sell it (only for a good price) is that I prefer the MoXF to some extent soundwise (and for the better keybed dynamics) and simply don't want to transport two full-size keyboards.