Where WP falls short is in the enterprise market, and this is where Drupal's ideal customer is. Drupal powers Tesla, Whitehouse.gov, Weather.com, Economist, NY.gov, and other major sites. So for Drupal to remain relevant to these types of clients it has had to play catchup. D7 changed a lot from it's initial release, and a lot of contrib modules helped make it a decent enterprise-level solution. But D8 is a whole new beast that really sets the bar pretty high. You can literally build anything in Drupal, and with it's new focus on having "headless" RESTful services, it can be used to power your entire content strategy (pushing content to apps, other sites, etc).