Make a correction first, CFA is not a job but a certificate for your professional qualification, like a degree such as MBA. You can be a CFA as long as you work in the relevant industry for certain amount of years and pass the 3 levels of exams. How much you earn depends on what is your job, i.e. research analyst/associate, trader, accountant and ect. A junior accountant with CFA might earn $45,000 to $60,000 whereas an associate level trader may earn from $100,000 to $400,000 depends on both desk-wide performance and personal contribution. A M.D with CFA may earn up to millions. However, CFA won't be significant factor when you are getting more senior.
What I want to say is CFA is defenitely a plus for any one want to seek a career in this industry and just started. However, it all depends on how much you want to devote into it and how much you want to get out.
I would suggest to take it since it is a way to push yourself learning finance systematically.