Fact is the best looking game ran at 900p and 30fps.
Not that it should matter.
That is not a fact, its an opinion. Please learn to distinguish between the two. If we're comparing technical merits - texture resolution, poly count, lighting, resolution and framerate, actual measurable qualities - pretty sure KZ: SF trumped everything.
Now when it comes to personal preference about how appealing the game looks overall, then we again enter the realm of personal opinion. And in case you're still struggling to pay attention, this thread is about Forza and its performance and merits in the 1080p department, so bringing up other games that don't even hit that benchmarch is and exercise in deflection.
Edit: The reason why Forza hit 1080p in the first place is because racers are corridor games, with small, fast moving environments where many details can be lost (in the motion blur, usually). As others have pointed out a number of compromises were made to hit that resolution. But you know that, if you've read any post other than your own here, and you are just being willfully obtuse.