7 million on the ps4 and 1 million on the xbox one so around 8 million lifetime.

FW
PS4- 600k(US) 500k(EU) 1.5m(JP) total- 2.6m
XBO- 250K(US) 150(EU) JP(9k) total- 409k
Lifetime
PS4 1.5l(US) 1.3m(EU) 1.8m(JP) total- 4.6m(5.6m with digital)
XBO- 800k(US) 400k(EU) JP(25k) total- 1.225m (1.45m with digital)
Total sales combined
5.825m(7.05m with digital)
And for fun if the Switch and PC gets ports
PC- 600k
Switch- 700k

4.5M on PS4, 0.5-0.7 on X1, so basically around 5M, it won't even beat FF9

In a statement to Famitsu, as reported by Final Fantasy fan site Novacrystallis, Tabata said the figure represents how many copies the team would like to see the game sell. It's not necessarily how many it needs to sell to turn a profit, however.

10 million is a big number and one that few games reach. Tabata acknowledged in his statement that it's a lofty goal, but said it represents the studio's ambitious outlook. "We've thought about what we need to do to achieve this number and tasked ourselves with this huge objective," Tabata said.

http://www.gamespot.com/articles/final-fantasy-15-director-clarifies-10-million-sal/1100-6436227/

Anyway, I think 7-8 million. 1 million or less on Xbox.

4-5 m on PS4
1-1.5 m on X1
800k-1.2m on PC

These PC predictions seem a bit high considering the best selling FF on PC is 7 and it barely hit 1 million.

If it's a good benchmarking tool, it will sell over 1m like Rise of the Tombraider and Doom.

But tomb raider and doom already have a big following on PC compared to Final Fantasy which most of the fans are on console. Also FF15 will be a late port if it does come to PC.

http://steamspy.com/search.php?s=rise+of+the+tomb+raider

http://steamspy.com/search.php?s=Doom

Lifetime sales: 7 million
NA - 3.5 million
Europe - 2.5 million
Japan - 0.8 million
Others - 0.2 million

PS4 - 5.5 million
XBO - 1.5 million

You skipped the "Benchmarking tool" part, maybe it's my fault for picking bad examples.

http://steamspy.com/app/302510

Ryse: son of rome, was a late port that sold well because it was a good game to push people systems.