My first reaction is that, if you're going to rely on VGChartz for one region, then you might as well take VGChartz for all of the regions, since VGChartz uses NPD and MC as inputs.
The graph is probably a fairly accurate mid-year snapshot. We know the sales picture is changing a lot in the last 4 months of the year. The PS3's best sales performance was early in the year due to MGS4 and later price cuts.
Lastly, since we are looking at VGChartz Europe/Other sales figures, you should check out the huge numbers for XBox 360 in "Others" this week on the VGChartz front page. It looks like fortunes have shifted in this region.
Vgchartz just recently began "adjusting" their 360 others figures in response to this following article (though theyd never admit it, the article hit various forums last week and vgchartz figures suddenly showed a major 360 spike the next week):
http://www.computerandvideogames.com/article.php?id=202230