I was thinking more along the lines of:
12/2: for shooting landscapes because I found the 12-40 pro to heavy for multi-day hikes and am able to fit this and an E-M5 in a small day pack with room to spare for essentials. And since I generally shoot wide vistas, I don't miss the longer focal lengths of the zoom.
Something like this would definitely help me if I were considering purchasing this lens. Just "12/2", not so much.
Or:
45/1.8: considered the noctitron but for the price, found that the 45 offers enough subject separation when ensuring about xx feet to the background. For indoor use, the shallower DOF and additional light gathering ability of the noctitron may be beneficial.