Benchmarks with various Drupal distros (eg Commerce, Commons)

With D8 I would love to see some cold hard stats benchmarks comparing mysql and mongodb storage backends for various profiles, eg vanilla D8, D8 with x content types and x nodes, or Drupal Commerce and Drupal Commons installs.

I have read some benchmarks on other mysql and mongodb projects, and I became uncertain if mongodb is really all that necessary.

I have read in many comparisons

• https://www.google.de/webhp?q=mongodb%20vs%20mysql#q=mongodb+vs+mysql
• http://stackoverflow.com/questions/9702643/mysql-vs-mongodb-1000-reads
• http://www.sarahmei.com/blog/2013/11/11/why-you-should-never-use-mongodb/

that you cannot really do such thing as its nosql vs relational, apples and oranges bla bla bla. But, after all, stats matter as well and in our case we have a clear target that is Drupal 8.