I have had my S5 for three years now, I love it. I do not love the price of and lack of lenses for it. I have thought about jumping to Sony just to have some variety that wont cost me the same amount as a whole new camera.
Hey! Thanks for the first comment! I can see that, for me the solotion has been to find a few lenses I like and sell the rest. I mostly use my 24-70 nowadays and don´t really need so much more. If you don´t use autofocus you can adapt old ef lenses and leica r lenses, for very cheap. That will be a project for me next year. I´ve also thought about Sony, so many times. If you like their color science, why not. They have entry level models, up to very high end cameras. Something companies as Panasonic lack.