That's not correct.
It's a german article, but there is also a video linked. There you can see the differenz. To see the differenz look at the left or right side, not at the car!!
http://www.pcgames.de/F1-2013-PC-257655/News/Fluessiges-Spielen-FPS-Unterschiede-in-der-Video-Analyse-1092855/
If you turn arround in the game, the FPS have an big effect, if it looks smoth or not.