Benefits of ACCA are in in context with the exemptions they provide to a qualified CA, as far as I know they provide exemptions at all papers in series of Intermediate level and two papers in Professional level. But you can’t quantify the pay scale after you opt for ACCA thus a value addition from ACCA can’t be quantified on an average basis, atleast you will have got a job around 6 to 7 lakhs pa. However, that you can also earn if you get your CA degree in first attempt by getting a good % also and get selected in campus placements.
What I suggest is if you are into financial reporting then please go for it without any expectations, other better options as per my perspective shall be CFA, SAP certification, Advanced Excel preparation.