There are two shades, one more subtle than the other, but just as deadly.
The first and more obvious resents another pastor's apparent success, begrudges his exposure or appeal, criticizes his approach to mission, questions his legitimacy and impugns his motives. He is infringing on your mission field, your territory. He is receiving the attention you ought to be receiving, garnering the opportunities that rightly belong to you. You've been at it longer and are doing it "righter." Plus, he's dumber than you.
Then there's the other side that sounds like this:
That guy's just jealous of me.
We ought to beware both postures.