yes, no bonus.
different department/team using different programming languages.
increment depends, 10%-20%.
But from what I get & what I knew, I feel UNFAIR that's the reason I leave.

Yes, when u joined, share with your close colleague then u will know, but some ppl may "keep salary information confidential" 
One of my colleague worked for 2 years to get his first increment. I also worked 1 and a half years to get my first increment.
So very depend on your joining timing.
I dont think can compensate the annual bonus, at least 14 months to do the adjustment, sometimes more than that.
which mean if you work more than 4-5 years, u loss 1 year increment in this company.