You find the first comparison between the 4 HD video modes at Sony HX5 - Video.
For this test I downloaded this and this test cart picture. I put the HX5 on a tripod and tried to get all of the full HD TV screen onto the HX5 display. WD TV was used to display the test cart pictures on the TV.
To compare full HD with the lower resolutions all non full HD screen grabs are resized to 1920 x 1080. Then a center crop of 640 x 640 is taken for fast and easy comparison.