Serious Eats guy on using a torch to finish a steak: http://www.seriouseats.com/2015/06/food-lab-complete-guide-to-sous-vide-steak.html#torchalone
My steak from last night, finished on the grill, needed more heat to sear but still delicious:
My steak from last night, finished on the grill, needed more heat to sear but still delicious: