The 2.8k pay is blanket across the board.

PwC - 2850 not sure if it comes with signing bonus
Deloitte - 2850 with 2000 signing bonus
KPMG - 2900 iirc, 3500 for first class
EY - 2850

Don't be fooled by the Strategy& or Parthenon acquisitions. It's solely from a branding perspective. PwC and EY now sell their strategy work under S& and Parthenon-EY. Due to the partnership model and the nature of the M&A, mostly only major markets like US/UK/JP are affected and monetary benefits goes to the acquired.

But if you do a quick LinkedIn search, the calibre at the strategy side are pretty decent, many MBBs so it still remains to be seen if they will become a force within the next few years.