Scores for Intel’s upcoming i5 8600K appear on the Geekbench database

These results appear to be using a stock i5 8600K, offering similar levels of single-threaded performance to Intel’s existing i5 7600K, while offering a significant boost to multi-threaded performance. This is expected given the architectural similarities between Kaby Lake and Coffee Lake, with Coffee Lake offering to more cores than the Kaby Lake equivalent. 

In effect, Coffee Lake is simply a Kaby Lake CPU that has been designed with more cores in mind, offering no real IPC increase to speak of. This means that Intel has effectively been using their Skylake CPU architecture for three CPU generations, offering higher clock speeds with Kaby Lake and then more cores with Coffee Lake.