Look, these were the photos chosen specially for Forza presentation. If we took some of the best GT5 photos from here and try to reproduce them in FM4, I bet they will also look worse. Somewhere GT5 is better graphically, somewhere Forza. That's my opinion
How can this opinion be reasonable, if you've never seen Forza, or taken pictures of the gameplay?
The developer taking a picture of their very best work, with all the tools they have access too, is not the same as you taking your amateur photo of the same cars. You compared in game play to promotional BS.
It's just radically unfair.
It certainly doesn't show that Forza is better graphically 'somewhere', if by somewhere you mean while you are driving cars in the game. Some of the Forza 4 photos are so radically better than the snips of in game play we've seen that anyone doing the bare minimum homework would not use that material for this sort of comparison.
By your standards, a ferrari photo calendar from 1976 is more technologically advanced than GT5.
http://www.youtube.com/watch?v=e1dezQY0Q3M
Here's what Forza 4 looks like. The physics seem, as usual, a lot less free. I am sure, like the other Forza games, that this game is less realistic, and much easier. The graphics are pretty good. They are better than Gran Turismo 4. There are cars in this video that are also in GT5, and there is a substantial difference in quality.
I'd say the race footage looks a little worse than GT5's better standard cars. Watch the video. The environment is pretty, the cars are on rails, and the physics seem pretty bad when the cars hit eachother or the wall. And the cars look like GT5 standard cars. Which isn't really that bad.
It still looks immersive and plenty good. I get it... you're hyping an upcoming game for attention. Perhaps there's some way this makes money? Best of luck, but you're setting up Forza 4 fans for disappointment.
It's shaping up to simply not be what you're presenting.