So, natural infection has an 85% efficacy against reinfection... even better than a single dose of a vaccine.
Score one for the anti-vaxxers.
Maybe than a single dose of J&J (or two doses of AZ, which was heavily used in the UK, where the study was done), but not the two dose regimes of Pfizer and Moderna. OTOH, the J&J vaccine, as well as P and M also reduce the severity of Covid for those who still get it. So, immune or much reduced severity, the risk of an unpleasant (or worse) case of Covid for the unvaccinated is much greater.