Wow, those fp64 numbers are excellent, this will be a real computational beast and in general engineering samples are slower clocked if anything, so no way performance will regress.
With the promised improvements to v-cache this series, 9900X3D will be the sweet spot for me.
A user on AnandTech forums recently posted AIDA64 test results of a Ryzen 9 9950X engineering sample. If the posted numbers are anything to go by, the 9950X will be an absolute beast of a CPU, having almost doubled the 7950X's performance in certain tests. However, it should be noted that synthetic benchmarks are not necessarily indicative of real-world performance, and the tests were themselves pretty workload specific.