I have been considering upgrading from my G3 and the GX7 is one of my choices but I am wavering and going back and forth from one camera to the next: GX7, GH3, G6, Pentax K-3, Pentax K-50. In addition to the G3 I have three Pentax cameras, the K-01, K-7 and K-10d. There is some great pricing on the cameras I am considering right now, I've compared images and specs from all of them. I usually do not have such a hard time trying to choose a camera but for some reason I am just unsure and would appreciate any input especially regarding the GX7 and what it offers or doesn't offer as compared to the other cameras. I mainly do nature photography and take lots of photos of my birds. I want something that offers high iso, does well in low light, fast autofocus, good ergonomics, good viewfinder. I have the following Lumix and Sigma lenses: Sigma 19 and 30/2.8, Lumix 14-42 kit lens, 100-300. I am planning on getting the 20/1.7. I know that my Pentax lenses can be used with micro 4/3rds with an adapter and those lenses are: Pentax 35/2.4, 43/1.9, 100/2.8, 55-300, 17-50 Tamron. I handled the GX7 at a local camera store as well as the K-50 and a few Oly micro 4/3rds and liked the GX7 and K-50 the best (although would choose K-3 over K-50). I do have some concerns about the placement of the viewfinder because I am left eye dominant. However, I did try to use the GX7 with my right eye and was able to do that although it's not natural for me but it can be done. I'd probably get used to it over time. Thanks in advance for any guidance/suggestions.