The good news about upgrading to Drupal 8 is that it looks a lot like Symfony, the bad news is that upgrading to Drupal 8 looks a lot like Symfony. I guess it’s just your perspective but if you have a lot of sites steeped deeply in D7, it’s quite a transition. However, if most of your code is a Symfony or other MVC-based framework based web dev shop without much invested in prior versions of Drupal, this transition will not only be easy, you will find your web team able to already recognize, find, and be completely familiar with all the essential organizational patterns under D8’s hood.
Red Crackle has a good list for those looking to transition from Drupal 7 to Drupal 8, just click here to read their list.
Information about migrating from Drupal 7 to Drupal 8 can be found here.
Here’s a useful video/overview of the transition and the major pros and cons.