In sunny 16 conditions, you might struggle to get large apertures with movie shooting. But otherwise, the professional guys are always talking about using consistent ISO when shooting, for consistent noise patterns.
The pattern noise is only an issue in the deep shadows. So if you're shooting a low DR scene (with ETTR), and/or, you're not looking to raise the shadow in post, then the pattern noise should be a non-issue.
For photography with largish DR scenes, consider dual ISO. The higher ISO in dual ISO, does an
excellent job of removing the pattern noise.
The increased DR at ISO 200, is due to the noise from the electronic components, reducing more, then loss of highlight detail. FPN is very visually distracting, but only constitutes a small percentage of noise figures. Considering this, the
perceived DR, probably remains higher, for higher ISOs, then the figures suggest.