INFJs are empathetic, want personal connection with others, values others in a group, is usually ritual (they love their friends, family, and religions stronger than others), are extremely good team players, and if/when manipulating, goes for the win win situation.
INTJs are extremely direct, organized, and decisive. They value competence in the group and if they do not see immediate competence, they'd rather work alone rather than helping. They are very moral and honorable.
INFJs you may know: Gandalf, Obi Wan, Yoda, Gandhi, Martin Luther King, and Magneto.
INTJs you may know: Walter White, Vladmir Putin, Arnold Schwarzenegger, and like half the super villains you know (the rest are ENTx xD)
INFJs usually look like this: =] (Small smile, like Mona Lisa)
INTJs usually look like this: -_- (This is called the INTJ death stare)