This is nothing new. I instantly noticed this last year when jumping from GT5P to GT5. GT5 feel less softer than GT5P, but to a level where it´s practically unnoticeable.
To be honest, I expected GT5 to look worst than it actually does. OP, how can you ask for this to be fixed? You realize how much content PD managed to put in this game, and still the game performs a thousand times better than other games, like NFS Shift for instance, which is painful to watch other than when it´s paused.
I think PD made a miracle. And yet there wasn´t too much they sacrificed, other than less cars in the track. Yet they added realistic smoke, sparks, damage, weather and a day-night cycle that looks simply unreal(in the good sense of the word).
Hasn´t anyone that drives through the Nurburgring with day and night cycle, wonder how the hell can this game run so smooth with so many content and details in a massive track full of cars?