Langenhan, who has two World Championships bronze medals to his name, most recently in 2011, produced a new track record with his first run to lead at the halfway stage and while Loch was quicker in the second, he held on to claim victory.
Langenhan's time of 49.252 seconds gave him the edge over Olympic and three-time individual world champion Loch, who was 0.104 slower in the first outing.
Loch responded like the champion he is and in the second run he piled the pressure on Langenhan, clocking 49.364.
But Langenhan responded and while his second outing was slower – 49.427 – his combined time of 1:38.679 was good enough to take the victory by just 0.041 from Loch, who won the opening World Cup of the season in Innsbruck.
David Moller posted the third fastest times in both of his runs to ensure a German 1-2-3, ending up with a combined time of 1.38.942.