Thanks. I should have mentioned I already looked at statcounter. The data for desktops is OK, but what I really want is the most common user-agent/resolution combos. It's easy enough for me to check the Apple ones, just by looking up the specs of recent models, but I don't really know what mid-range Android phone specs to target, as there are so many models.
Be patient. It was really slow.
As for browser, the breakdown is
URL: http://gs.statcounter.com/#browser-CN-monthly-201303-201403