Ok... PS4 have sold for now 900,000 in UK, versus 600,000 in Japan. It's true, PS4 comin after in Japan that in UK, and this have advantage of Chrismas in Uk, but if watching the recently week, PS4 sell more in UK than in Japane.
this week- Japan: 7,747 UK: 9,277
Last week- Japan: 8,641 UK: 9,851
week of 31 may- Japan: 6,589 UK: 17,682 (but this week coming Watch_Dogs, so is normal that sell much more...)
week of 24 May- Japan: 7,352 UK: 9,320
week of 17 May- Japan: 6,912 UK: 9,533
...In short, is one month that sell more in UK.
Much people will be reply "But when coming FF XV PS4 sell 999,999,999 on week and outsell all record of sales!!!1!1!!11!"
Yeah... i don't think.
For me PS4 will sell good in Japan, but will be a console of niche like Wii U, and all home console.
But in UK will be a fucking succes, and sell much easy more of XBOX 360.
I predict 7,000,000 PS4 in Japan lifetime that is good number for one home console, and in UK i'm sure more of 10,000,000(even 15,000,000).
So, PS4 i think UK sales>Japan sales.