Horrible just horrible http://www.gameranx.com/updates/id/19532/article/the-people-in-gran-turismo-6-look-absolutly-terrible/
GT6 
Forza 3

Overall Forza 3 has better textures, performance, better people animations and better damage. I'm comparing Forza 3 and GT6 because they are the second installments on the HD twins. I cut Sony some slack by taking out GT5 prologue and the GT5 demo that looked bad. GT6 might have better lighting and blur effects. GT6 has more cars on screen (although it's a much dumber AI), and day/night cycle. Everall GT6 and Forza 3 are similar with Forza 3 having the edge.
















