For me, "others in your line of work" simply means people in the same field.
A store manager, assistant manager, checkout worker and shelf-stacker all work in retail. They are all in the same line of work.
However, in the piece you posted, it suggests that they are people at the same level. It would a little pointless for a store manager to try to gauge his effectiveness at work by comparing himself/herself with a shelf-stacker.
Student or Learner