Sold off my EM1 with 12-40, PL25 and 75 lenses and got the GM1 with 12-32, 15 and 35-100. Kept the 45 since it was a little damaged. And very light and compact lens. I'm now thinking of getting the GX7 with the 20 or maybe the O25, what do you think of that? Is the 20 too close to the 15?