While workstation graphics are a niche for most readers, some might consider using the -9900K's eight cores and 16 threads for professional tasks. Really, though, there aren't many threaded applications for real-time graphics output. These benchmarks mostly benefit from high IPC and frequency.
Cinebench profits equally from more cores and higher clock rates. That makes it one of the very few benchmarks able to show off what Core i9-9900K can do compared to Core i7-8700K.
The older versions of Maya and Catia appear to be bottlenecked, despite the potent Nvidia Quadro P6000 being pushed to its limit. In the end, it makes no difference whether the CPU is overclocked or not. The differences are marginal from the Core i7-8700K upward.
The Blender loop relies on OpenGL and real-time graphics, but host processing power still helps. However, these applications use hardly more than four cores, so high per-core performance pays off.
The same could be said for the GPU composite score of 3ds Max because, in the end, the highest clock rate wins. Multi-threading is not really in demand.
To summarize, we could say there is little added value in upgrading from a fast quad-core to a slightly faster eight-core CPU in these types of applications.
MORE: Best CPUs
MORE: All CPUs Content