I don't take forum chat as any particular proof of sales. Primarily, I simply look at live shows on TV, try to spot what is being used.
Massive Motif dominance there, but admittedly, it's been out a lot longer than the Kronos. Not to mention, the Kronos is another step UP in price point, Yamaha don't really make anything in that ballpark yet.
I played one quite a bit (both, actually). On the whole, I still felt the Kronos sounded very 'Korg-ish' and reminded me quite a bit of the M3's and even Triton overall basic sound. Not that that's a bad thing (still have a Triton), but I was hoping, along with the new streaming capabilities, to have something that departed radically from what came before. There are some amazing things it can do, but as a pure gigging machine, not exactly head and shoulders above anything else, particularly the XF series. But it's a good start. And hopefully, the streaming from SSD approach rapidly becomes the norm.
What an addition to an arranger that would be!
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An arranger is just a tool. What matters is what you build with it..!