simply curious, as I cannot find any sales figures anywhere for Steam purchases, let alone PC purchases of both versions of the game.
I’m not sure. It must have been well enough, considering they’re also releasing SFxT on PC in May.
i know steam version only represents a portion (how small or big i don’t know) of copies on PC but I never ever see it on steamstats top 100 played games.
http://store.steampowered.com/stats/
you can scroll all the way down in Leaderboards for ALL regions and see how many people are listed 
i tried that once… they were like 50-60k people, but the scrolling function is pretty retarded and takes a long time
i had to place two heavy objects on the down arrow key & on another key that lets you scroll by 100s on my keystick and leave for like 20 minutes then come back to check it out
from a similar thread
"NPD doesn’t count online game sales, they only count retail sell through.
But the numbers don’t matter much companies can just bs them to make themselves look better, like Bandai Namco claiming that Tekken 6 sold 3.5 million copies when it really only sold like 500 000 sell through."
Steam doesn’t release sales numbers so it will always be a guessing game.