I know this is a very daring and sensitive question to ask, however I'm sure every working adult out there is interested to know due to the lack of transparency.

So what I heard is this:

If A and B (same GEO/MX rank) put in equal amount of effort in their work and produce similar results, but A makes his contributions/achievements very public or loud (due to his extroverted/power-hungry personality), while B remains low-profile and humble (due to his introverted personality), the higher grade is still awarded to A.

It would be helpful if any (very) experienced staff or even KPs are able to enlighten us on this.