[UPDATE] Fresher benchmark is here.
Recently long-awaited Sphinx 3 was released and updated in 3.0.2 . It has got documents storage capabilities, A-indexes, snippets pre-indexing and unfortunately is not open source any more (at least now, in March 2018).
Those all are very nice features, but are you interested in how much they affected the performance of Sphinx 3 and how much that differs from Manticore's performance? We too!