My 'main' camera is a Nikon D800. It is now outdated and superseded by the D810; I don't have any plan to update it in the next year and probably not the year after that. Along with the 16-35mm and the 70-200mm, I usually carry my 50mm lens. None of them heavyweight but together I know they are in the bag. For some years I carried a Nikon DX format camera when weight was critical. A D3200, 18-55mm and 55-200mm seemed to weight almost nothing in comparison. The image quality was beyond real criticism in my opinion. Of course (since they performed perfectly...) I allowed myself to be seduced into a change. I sold the DX stuff and invested in a Fuji X-Pro1 and a few lenses.Is there a dramatic leap in the quality of the pictures? No. Do I enjoy using it? Oh yes. There is a great feel to the camera and lenses. Increasingly even Nikon's top end lenses and camera seem to be covered in plastic. The Fuji stuff just feels good. As a lightweight kit it works really well and makes a huge difference if a very long day is planned. The optical quality is high, reliability so far is fine but there are, shall we say, some idiosyncrasies.