Scientiamobile has a MOVR report for April to July 2014. It’s a free report (pdf) based on WURFL and WIT usage data. It gives information on smartphone and tablet use across manufacturers, devices, operating systems, screens size and countries.
The report covers only a small subset of the raw data that’s also available as csv and JSON data. The data is useful if you wish to analyse usage in a specific country or for a class of devices.