Don't just go by the low price, because those old reflex bodies end up being a headache down the line. The 5D Mark IV is still a decent camera for travel (40k shots is pretty heavy use but it still has life in it), but if you're starting from scratch with lenses and accessories, you'll end up spending more on the reflex ecosystem than on a newer mirrorless that gives you better autofocus, better stabilization, and more up-to-date tech. Do you already have Canon lenses or would you be buying everything from scratch? That changes the equation quite a bit.