Of talent, yes.
Of practicality... no.
Okay, well here are some numbers, just for the sake of numbers.*
Career FIP: Johnson [3.16] Felix [3.39]
Career xFIP: Johnson [3.52] Felix [3.31]
Career WAR/GS: Johnson [0.16] Felix [0.16]
Career K/BB: Johnson [2.74] Felix [2.94]
Career IP/GS: Johnson [6.42] Felix [6.77]
Both pitchers debuted in 2005, Johnson at the age of 21, Felix at the age of 19.
Since this debut, Johnson has pitched 725.1 innings, while Felix has pitched 1312.2.
Talent level is roughly even and an argument could be made that FIP is the most important stat listed (which I don't personally believe, but some might) and therefore Johnson is better. WAR/GS shows a difference of less than 6 thousandths in Johnson's favor, but I also didn't subtract out his innings, WAR, or anything else from his relief appearances, but counted those toward starts. But then durability and age clearly favor Felix.
I like Josh Johnson. I like him a lot as a player. When he's pitching, he's right there with Felix and various other guys under the age of 28. But I have a horrible nagging suspicion that his future might look a little like Erik Bedard's past.
*This would be where Headache would check out, not seeing those meaningful pitchers' stats of Wins, ERA, and WHIP.