Oddly enough, QP paid the same to all nationalities and may well still do but using the WIA and apparently now also other allowances to differentiate.
Historically (1985 era), Western staff in Qp were earning 15% less than their equivalants in such as Shell in the UK (after tax). They (QP) couldn't figure why turnover of Western staff (39% a year) was so high.
Asian (using Indian as an example) staff faired relatively much better as their disposable income was 12 times what it would have been had they been working in India. We had a Senior Clerk who was very proud of his home. So would I have been, massive pillars at the entrance, a great deal of marble and a very nice large pool. He also owned a shopping mall that his sons managed.
Good for him I say but don't bleat because it may not be happening in other companies.