BK-9 dropped out!
I just checked the Thomann website. No more BK-9 listed. When I google for BK-9 Thomann, I find a page saying "This product is no more in our product range" (in German).

Regarding the comparison: E-A7
-is cheaper (around 1,100 vs 1,700€)
-has more world/ethnic sounds
-has NO SuperNatural sounds
-has a 128MB RAM for samples (but probably not conveniently usable for sound packages/libraries).