I think it's pretty safe to assume that 30% of buyers decide to pick downloadable version up (according to surveys) . It would give around 140k as for week one. Solid as for multiplayer only game.
I'm sure Sony makes a lot more money on downloads - I wouldn't be surprised if they earn twice as much as for retailer version.
Yes, but like i said above, games were released on 28th and 29th of August, and this numbers are for sales up 1 September. So what that means is that they were on market for 4-5 days, less than a week.