edit: has anyone seen this? is this what the power lines look like in game?
http://images.eurogamer.net/2011/articles//a/1/4/1/1/1/9/0/PS3_018.jpg.jpg
Yup they did. I commented on this in a post many a moon ago, where I speculated that GT5 probably renders some stuff at lower res to help keep pace. The power lines were a prime example of this, but there were others to suggest that GT5 was heavily cheating.