Here's what people thought of Chris Johnson way back when. I remember because I started a thread to point out that Chris Johnson was a better fit for Dallas than Darren McFadden would have been.
It's interesting to go back and see what people really said
http://cowboyszone.com/forums/showthread.php?t=114768
As of today, Felix has his injuries and Chris Johnson has had his share as well, so with their rookie years in the books, it's still too close to call, because you never know who is going to be the most healthy in the long term. Felix may get over it, despite how bleak it is now.
Bottom line: It's still too close to call, both are exciting players.