On the topic of how many people we know with covid, I currently personally know 3. But I know at friend's workplaces and in their families they've had more cases now. During first wave I knew nobody who had actually had it.
One lad has passed it onto his mother after posting constant conspiracy nonsense on facebook for the past few months. She is now in hospital.
I mean, 10 other people at his workplace that he's in close contact with daily have also contracted it within the past few weeks. (not all at the same time). I'd say it could be a good chance kind of 50/50 tbh, also it's not just him I'm sure there will be many situations like it now that people are finding out what they were given during the trials.
Covid-19: Pfizer vaccine efficacy was 52% after first dose and 95% after second dose, paper shows.
here:
https://www.bmj.com/content/371/bmj.m4826
Higher than zero. But we will need to wait and see as more develops.