During these four years, I never owned any full frame camera. I played with Pentax APS-C DSLR for two years, Canon APS-C DSLR for over 1 years. Then I went to m4/3 mirroless camera for another year now. Finally I move to full frame. I will still keep my Panasonic GH3. And I am going to buy some Nikon lens. So I can adapt to both cameras easily. First time own a full frame is kind exciting for me now.