There's only ONE thing the G1000 has got that is better than the BK-9.... and that is the keys. That 76 note aftertouch action is the best in the business. And it had aftertouch.
But in every single other regard, the BK-9 is a MASSIVE improvement. Better sounds, better styles, better OS, sliders, MP3 playback, audio loop synchronization, editing, Hammond organ, you name it.
I had a G1000 for ten years, then a G70 for eight or so, and now the BK-9. The BK-9 is a keeper...
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An arranger is just a tool. What matters is what you build with it..!