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Not sure what you mean by Corona native siding materials, but it's a common issue with displacement, it's just not very good at steep, sharp corners. You can improve situation by lowering displacement screen size as suggested, but it comes at the price of increased RAM consumption and longer parsing time and the issue is still there, just less visible. Better solution would be to modify your displacement maps by blurring them, so that displacement wouldn't have to work so hard and give much better result even at default settings. The downside of that method is that it can slightly change the look, so you must keep an eye to not over done it.
Not sure what exact shader can be used in C4D, but in Max I would use the Falloff as a mask inside a Mix node.
Just a quick note, to see if we are on the same page - the directionality for the Corona Light was to give hard shadows from a very large light that was intending to be like an "ambient" light to fill the scene in general. You can get hard banding and hard shadows from a e.g. a sphere light simply by making it very small (and because intensity is measured in light emitted per surface area, increasing the intensity significantly). It's only if you want something large where you have to get into high directionalities for Corona lights.
Though it is just easier in general to use the non-physically realistic Max lights in that case since those actually have zero dimensions and are true point lights :) That's the thing about a Toon result, you don't really want physically realistic lighting in it anyway. You can see that even very small, there is still some slight softening in some edges from a Corona light - which could be beneficial, or not, depending.
Attaching a version of the scene with small Corona light in it, but still, easier and faster to render to use the Max lights, where you also have the option to have shadows or not.
