Given Israel has the highest rate of vaccination, it offers the best 'real-world' data on efficacy.

But to get that you have to filter through the propaganda headlines like this:

"Israeli data suggest mass vaccinations led to drop in severe Covid cases"

Here's the actual data that headline was based on:

The dark blue represents under 50's. The lighter blue is over 70's of whom 84.3% have had two shots of Pfizer. The graph shows the number of patients who required a ventilator as an indication of severe disease.

In fact, there's no significant reduction - there's been an increase in severe disease for over 70's since vaccines began with a slight tapering in the last few days of the study - but nothing you could draw conclusions about.

The headline was contrived using a dodgy twisting of stats represented by the black line. Basically it says that the number of under 50's requiring a ventilator has increased faster than the number of over 70's (both of which have increased steadily), so this is used to argue that the rate of severe disease in over 70's has dropped relative to the rate of increase in under 50's. That's the only way the researchers could wring something vaguely positive out of the data.

Again, this dishonesty was perpetrated by scientists then duly disseminated by the media.

There should have been two stories from the study with the following headlines:

Severe disease increases in over 70's despite vaccine

Alarming jump in severe disease in under 50's