Fifteen is a pretty big number. Quite the milestone, one might say, from a purely numerical standpoint. Especially for a relatively small company, the likes of Meizu. But going by pure volume can't really be any indication of quality. Experience, perhaps, to some extent. Also, it's fairly obvious that Meizu skipped a few numbers. Actually, it staring out started counting from 15 - a special model, meant to commemorate the company's fifteenth anniversary.
Source: https://www.gsmarena.com/meizu_15-review-1787.php
