The Lenovo Z6 Pro is a quad-cam flagship with the Snapdragon 855 processor, and yet has not had much availability worldwide. This has been addressed somewhat with the announcement of a release event for this phone in India. It will be launched in this market with the K10 Note and A6 Note on September 5, 2019.
https://www.notebookcheck.net/Lenovo-Z6-Pro-to-be-released-in-India-alongside-2-new-phones.433559.0.html