on the tech view
F3 runs 1280x720p 60fps Msx2
but GT5P does 720p 60fps Msx4. 1080p 60fps with msx2, and have more impressive lighting, transparency and shaders overall with more cars.
on paper imo some screenshots forza 3 cars look like they have better shaders, the thing it's lighting it's not as impressive, and not all car are like make if christmas three accesory glass.
turn 10 its implementing things like facebook features , sell cars online. etc
though such features being worked on GT5, with GT world plaza, on top of that WRC and nascar, with weather and damage support, not premaid models, but a full deformation engine.
here is forza 2, no lighthing at all.
here is forza 3, lighting implemented, shaders take hit, but to make it look more realistic, still not as advance as GT5P
