I just got my GX7 last week. Have the 20 and 45mm. I'm primarily interested in portraits of my kids. I'm used to a longer f2.8 zoom on APS-C. I really like to make pictures like this when I have the room: 88 f2.8 on Canon APS-C = 140mm eq.: Untitled by The Wiki, on Flickr 90mm f2.8 on Canon APS-C = 144 eq.: Untitled by The Wiki, on Flickr 85mm f2.8 = 136mm eq Untitled by The Wiki, on Flickr I don't want to drop the $600+ on a used 75mm because I'm kind of a bang-for-the-buck kind of guy. I keep trying to tell myself I will be fine with the 45 and maybe a 60mm f2.8 Sigma. I've NEVER spent $600+ on a lens, even on the DSLR. But if I'm going to end up at the 75mm anyway, I might as well just take the quick path, right?