You can see it here ...
Company — 4Q14 Units — 4Q14 Market Share (%) — 4Q13 Units — 4Q13 Market Share (%)
Apple — 74,832 K-units — 20.4% — 50,224 K-units — 17.8%
Samsung — 73,032 K-units — 19.9% — 83,317 K-units — 29.5%
Same source and article that you have ... showing Samsung declining and Apple taking over ... :-) ...
The iphone6 came out in September, so of course they had a good fourth quarter. Every Apple customer was compelled to buy a new phone during that quarter (in their never-ending quest to get something that approaches decent). Only looking at one quarter is the same sort of self-deception that climate change alarmists use to claim that numbers for a sliver of time represent some sort of big trend.