I certainly aim to keep things as well-lit as possible. I very rarely shoot outdoors, so can’t give an experienced answer about those conditions, but I do aim to keep the iris as open as possible, and go for slow shutter speeds, in order to keep the gain below 0dB.
Most of my final output ends up on YouTube, where, to be honest, the compression is such that there are actually very few problems with noise on the XF200 footage. But I do have to be careful to avoid zooming in too much on footage for effect, and some compositing effects are difficult. For example, when adding a vignette effect, the mid shades can really emphasise the noise.
BUT – this is still a great camera for what it is. 10bit 4:2:2 recording on a small, cheap camera is great. And the combination of the handling, image stabilisation and auto controls (if you want them) mean you’ll often get much better footage than with other similarly priced cameras, regardless of the noise.