Robert_Charlton - 7:29 am on Jul 8, 2013 (gmt 0)
Sorry that I'm not able to do a screen capture of this right now, but here's a query that sometimes shows 8 images, which I think is general enough for us to mention....
It produces something roughly similar to the described results, but not what I'd call 50/50, though you could accomplish that by making your browser window wide enough.
At the narrowest browser width to allow 2 rows of 4 images each, though, the ratio is closer to 700 px for left column, and 460 px for right, roughly a ratio of 60/40.
I'm seeing the page display eight (8) shopping results in the upper right corner for the above query on Firefox only, but that may just be what I happened to see. On Chrome and IE, I see the page display six (6) images (in 2 rows of 3 images each) in the upper right corner, which may be what was there before....
As I'm also seeing it, the left organic column width, margins, etc, are not changed between the 6 and the 8 images pages, but the overall window opening needs to be wider to see the 4 images to a row... about 80 px wider. In the right (paid) column, the 4 images per row display also results in a slightly narrower right hand border on that column. Organic borders are the same in both displays.
The 8 images in the upper right definitely pull the eye more than 8 images do.