Some initial Cinebench scores popped up, VideoCardz published an overview. All these parts have a 45W TDP. The Core i9-8950HK basically seems pretty close to a Core i7-8700K desktop chip.
According to the leak from a Chinese website, the i9-8950HK reaches a score of 204 single-core in Cinebench R15. This is a Core i7-8700K territory. When it comes to multi-thread performance the i9-8950HK actually scores lower than 8850H and 8750H. The reason behind this is unknown, it could be anything from TDP limit to the actual testing platform.