I got both games recently, just finished installing 5 and did a little test. Picked the Ferrari F40 and that long city stretch with the fireworks. GT5 has noticeable better reflections and shadows, very obvious in cockpit view, the car in 5 casts shadows on itself outside and inside, while in GT6 it casts shadows on the road only and the shadows you see in the cockpit seem to come from the environment only not the car itself like in 5. Not saying the game looks better everywhere but there are some very obvious downgrades in favor of the day/night cycles among other things like the new handling I assume.The overall picture also looks sharper in 5 to me, including the car model, really nice and shiny. BTW where do I turn the damage on in 6? I looked and couldn't find the option while in 5 it's right there in the driving options, I chose heavy damage and was pleasantly surprised to see some visible damage after crashing into a wall, warped spoiler and back bumper sorta falling off, it's quite sensitive too and after that I couldn't even keep the car straight due to the damage. As for the handling I'm not a pilot nor do I own a car capable of more than 160km/h lol so I'm not sure about that, but the F40 felt better to me in 5, even though the suspension seems to look more realistic in 6.