This seems to be the most important take-away from the article:

Two doses of Pfizer (PFE.N) or AstraZeneca's (AZN.L) COVID-19 vaccine are nearly as effective against the highly transmissible Delta coronavirus variant as they are against the previously dominant Alpha variant, a study published on Wednesday showed.

Forget about the efficacy percentages and watch the video posted on "Vaccines in a Nushell".