OM-D -- Eliminate 1 Lens from 4 Choices

I have the 12, 25, and 45, and I'm considering selling the 45. It's mostly about what I use, but also I'm not as impressed with the 45 as I am with the 12 and 25.  I haven't used the 75, and might not find a lot of use for it, but I'd like to try it out with the 12 and 25 as my M4/3 kit.