Competition between employees can be really bad as well. In general you want to be working in a non-judgmental environment where people are not afraid to ask questions, share their ignorance, and teach others what they need to know.
If you often find yourself not daring to ask questions, or display your ignorance, maybe you should think about moving on.
I worked at an Investment Bank that did stack ranking and I worked with very smart people. So smart they figured out that helping out new guys on the team did absolutely nothing for them- any time spent not working on their specific OKRs was just detrimental to them. There was no incentive to help new guys on the team, and they were happy to just let them sink or swim.
I couldn't stand to see that, so I would help mentor the new guys, and it often did cost me a lot of time and affected my deliverables.
The joke was on us though- everyone was fighting for a bonus pool that largely didn't exist (this was in the aftermath of the financial crisis). Your only way "up" was to get out.
If you often find yourself not daring to ask questions, or display your ignorance, maybe you should think about moving on.