GT4 it is not
Gran Turismo 4 had a 1080i option (if you had the correct cables). Using this setting, GT4 looks better than FM2. A good example is the Buick Grand National. Also the shading is off.
The game play is off as well. The controls feel sluggish at times and at other times overly sensitive.
I do like the menu system for upgrades, purchases and racing.
I know a lot of this sounds harsh. However, it still is a good game, just not awesome like I hoped.