Believe it or not, 3DS games with high points on COMG usually have bad ratios and is the opposite for PS4 games.
My original prediction was terrible.
http://gamrconnect.vgchartz.com/post.php?id=8372410
I assumed the 3DS version would just take off considering 1. It's DQXI and 2. 3DS has a 21m+ install base.
However COMG leads me to believe a different story, so my new prediction is:
PS4 950k
3DS 850k
Remember FFXV had 480pts and that became 690k FW, DQXI on track to hit around 750pts PS4 and 670pts 3DS.