ok Therese allot of crazy post in this thread, so i'll say what i see.
Forza is brighter then GT5 until the sun passes inside the car on the inside of the GT5 car.
as for this stupid audio argument. i heard one car sound so the audio comment is stupid and unfounded.
Forza tries to show more detail by being brighter and it works for the road, but not the cockpit. that cockpit is just blurry and i have 20/20 vision so don't try to argue this point.
GT5's lighting when the sun passes inside the car shows as light and not something made to make the car more detailed. GT5's sunlight is done perfectly.
last but not least Seece and op. your right it doesn't matter. growing up is a part of life for some and for others...............................................................