So I think this is something you guys will definitely be interested in. I've actually been looking at the 'hourly' rankings between the PS4 and XB1 versions of FFXV and KHIII since Tuesday. The results are rather eye-popping.
Here were the rankings on Tuesday:
#8 FFXV PS4 version
#18 KHIII PS4 version
#356 FFXV XB1 version
#401 KHIII XB1 version
On Wednesday:
#9 FFXV PS4 (down 1)
#32 KHIII PS4 (down 14)
#356 FFXV XB1 (--)
#482 KHIII XB1 (down 81)
On Thursday:
#13 FFXV PS4 (down 4)
#55 KHIII PS4 (down 23)
#344 FFXV XB1 (up 12)
#624 KHIII XB1 (down 142)
Today:
#37 FFXV PS4 (down 24)
#84 KHIII PS4 (down 29)
#828 KHIII XB1 (down 104)
#960 FFXV XB1 (down 616)
This is interesting because despite Amazon taking 20% off preorders for Prime members, interest for the XB1 version of FFXV and KHIII has actually gone worse. I mean FFXV XB1 fell by a whopping 616 places for crying out loud. In contrast, the PS4 version of FFXV maintained constant interest from Tuesday through Thursday. Even though it dropped a lot today, it is still ahead of the XB1 Gears Bundle. Interest for the PS4 version of KHIII didn't peak as high nor lasted as long as FFXV, but it is still in the Top 100.