hello... as requested i am posting a screenshot of the same frame with local dimming on and local dimming off from the LG5500 series...
LOCAL DIMMING ON
LOCAL DIMMING OFF
(shot with a point & shoot camera with ISO set to high, no flash. trying to keep my hand as steady as possible. heh heh.)
from the thumbnails alone... you can see that keeping the dimming set to on show's more detail. when it's off her skintone seems more washed out... less details. but from the background you can see that the blacks still register the same. it's not a dramatic difference really.
also, i noticed that the severity of the "bleeding" of the backlight really depends on which angle you watch it. the more you watch in an angle... the more you see it. personally, it didn't bother me as much since i usually watch straight on. plus, i have read that bleeding seems to be a problem in all, if not most, backlit screens. i see it even in plasma. and the one here isn't too severe, i think.
BTW, have you guys updated your firmware yet? the latest US release is V08.02.16 ... it added a few more streaming services like VuDu and MLBtv. not quite sure what else it did though.