Khoi Vinh has a nice rundown of what software designers use today. In every class I teach, I get questions about what software should be used to design websites. The students just want an answer ("go use Photoshop") but, as Khoi has points out, it's much more complicated than that. My own research in this area has very similar findings. Although, I would say that Sketch has taken more of a foothold on the West Coast than he insinuates especially in small shops.
An especially nice quote from the article:
Overall, the visits confirmed to me that the landscape is significantly changing for how we designers do our work and what tools we use, but it seems clear that there’s room for a lot more innovation going forward.