Japanese gaming magazine Famitsu published a list with the top 100 best selling games in Japan in 2014. We can see the PlayStation 3 version of Metal Gear Solid V: Ground Zeroes at number 19, having sold just over a quarter million copies, 260.852 to be exact.
A bit lower, at number 48 is the PlayStation 4 version, with 144.798 sold copies. It’s the best selling PlayStation 4 game in Japan aside from Knack, which came bundled with the system (there seems to be a small inconsistency with earlier released sales data on the game, but perhaps they numbers have been readjusted for accuracy).
So put together that’s well over 400.000 copies sold in Japan alone, and that’s not counting the other versions, though they likely sold a lot less.
Source: Famitsu, via Nintendo Everything