Why don't I think Aries is the most envious sign? I'd put Aries fourth in the envy rankings. Envy is "I don't need it, as long as he doesn't have it." Aries is about "I need it," even if it means stepping on someone—a friend or the president, a boss or a subordinate. Aries does everything simply for profit; their reputation is unconcerned.
Aries compares themselves to others not out of envy, but because they want to know how much they've improved compared to their previous results. Everything is about themselves; that's the zodiac sign "I"—me first, and then others. Aries also often compare products to see who's better; it's practically a favorite pastime; they recognize the best craftsmen, and the best ones are those who do good things for them.