He's 33/48 for 420 yards and 5 TDs. Parker is 25/42 for 303 yards and 1 TD. Who would you rather have right now?
Receivers aren't magically better in the endzone, so unless he's on my team or on my fantasy teams, touchdowns doesn't mean a whole lot. Matthews does have more yards and a better catch percentage, though, so yes, he does look like he's playing better than Parker.
He's also being paid $5 million a year, which I'm not sure he's worth. Parker is four years younger and paid half that.
Would I rather have Matthews right now? Maybe, maybe even probably, but looking at his career stats I'd be hard pressed to say that he has more potential than Parker.