At this point PUBG is selling roughly 4 million a month.
Source: http://www.usgamer.net/articles/pubg-crosses-20-million-sold-ahead-of-xbox-one-release
Also note that PUBG could cross another achievement threshold, 2.5 million concurrent players on Steam. I don't believe Call of Duty can even hit these numbers on one console. It would be interesting to see the regional breakdown.
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