OM-D -- Eliminate 1 Lens from 4 Choices

Tough call between the 45m and the 75mm.  I would not give up either the 25mm or the 12mm, both are just fabulous lenses.

The 45 is an excellent lens, but I find I use it rarely, and I almost never shoot anything at 75mm....

Probalby what I would do is give up the 45mm and use my favorite vintage 50mm in that focal range, but go with the 75 instead....

-J