Malaysia largely switched to Pfizer from Sinovac some time ago, mostly due to supply issues and contractual agreements according to the authorities.
Well, according to the Johns Hopkins website, Malaysia's covid case count has been going on an upward trajectory since about the time of the vaccine switch, contrary to what the western vaccine hyper supporters would expect. This is in consideration that by now I am guessing at least the same number of the population (if not more) have already been inoculated with Pfizer compared to Sinovac.