Both are pretty similar in the sense that they involve secret organizations going head to head with government organizations. At some point the main characters of both are seen as traitors and must struggle to find the real culprits while proving their innocence.
Both have the same feeling of suspense, and keep you unable to predict what will happen next. Although Midas has a more business-centered plot, it is definitely as addictive as Iris and keeps you feeling anxious until the very end. A good thing is that the end of Midas is far more optimistic and not so tragic as the end of Iris.