Although Google is still way behind the giants that are Apple and Samsung, the Pixel 2 and Pixel 2 XL reached more than 3.9 million customers in 2017. However, both Google's handsets arrived in October, making this number of sold units quite impressive.
https://www.notebookcheck.net/Google-has-sold-3-9-million-Pixel-handsets-in-2017.282826.0.html