I don't think it matches the 8700K. Here are the scores for my i7-8700 under Windows, macOS and Linux. Results seem to vary quite a bit between different Geekbench versions.
This article. They've run SPEC2006 suite on the R7 1800X, i7 6900K, i7 7700K and A12-9800 using MSVC and ICC2017 compilers with SSE, AVX and AVX2 flags. AVX2 results were only marginally better.
Looks like both 7800X and 7820X have full AVX-512 throughput.
http://www.pcgameshardware.de/Skylake-X-Codename-266252/News/Core-i7-7800X-AVX512-Durchsatz-1232713/
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