As mentioned, mobile friendly websites will get a rank boosting from Google starting April 21, 2015. It would appear that this is starting earlier as mobile sites are labelled as such when doing a search on a mobile device. See the screenshot on the left from my Android phone and the screenshot on the right performed on my computer – the search was conducted from the same wi-fi connection approximately 2 minutes apart – notice the results are different and the mobile search points out if a site is mobile friendly.

Screenshot_2015-03-07-09-07-39 Capture