Psychologists study thoughts and feelings, sociologists groups and how they're put together.
Only anthropologists are trained to put all the pieces together and only after we've rubbed our noses in the nitty-gritty of what's going on in the situations we study. That's our edge compared to practioners of other disciplines who abstract what their disciplines tell them to look for and are likely to overlook important things that lie outside their professional blinkers. They may be good with words or numbers. That's another question. At the same time an anthropologist is a trained observer who knows the importance of stepping back and adopting a broad perspective.