Is this a good offer?

First of all, I think this is a good offer so this is more of a justification post than anything else.

I went to CMU and graduated 4 years ago. I worked for a startup for four years, and have recently been offered a job at a top tech company in Silicon Valley. The offer is 121k base, with 12.1k annual bonus and 150k in RSUs vested over four years. I initially thought this was a great offer, but after talking to someone else who is the same age, they are making significantly more at another top tech company. Is this offer fair or should I try to negotiate for a higher offer?