MLB Network posted a video comparing primarily mechanics and movement to Roy Halladay. Billy Rikpen calls Cahill "flat-out ridiculous." Nice to see this piece and seeing Cahill get a lot of spotlight after his great start. He also goes on to say that he doesn't know if Cahill has a nickname but right now looks like a Young Doc.
Link to MLB Network Video
A few stats through their 21-23 Seasons (Note: Cahill is currently in his age 23 year)
Halladay (13-14) 5.78, 230.3 Innings, 139 K, 123 BB (57 Games and 33 Starts)
Cahill (34-21) 3.51, 427.2 Innings, 253 K, 151 BB (70 Starts)