As beautiful as these sweeping shots of expensive sports cars are, they're not from some slick Forza or Gran Turismo trailer. They're from a Grand Theft Auto V Rockstar Editor video. Thanks mods.
RisingJake's clip looks so good for two reasons: First, it uses a number of existing, user-created fancy car models that bring licensed vehicles like a Lamborghini Aventador LP an Ferrari LaFerrari to the game.
Secondly, it uses "post processed video effects", which might take a little of the sheen off the video, since things won't look quite this nice in the actual game, but whatever, the models still look hot.