I have never heard of cooking a steak in an iron skillet.
I am going to try it!
I heat the skillet on high for a full five minutes before the room temp filet goes on. It's very important that the steak rest for 10 minutes before eating. Before eating, reheat the pan and scrape all the lovely juice and tidbits over the top.
I moved in to an apartment and don’t have access to a grill now. I have switched to a cast iron skillet and, if done properly, it’s almost as good as grilling.