I have just finished re-building a 2013 computer for a friend which now has an i7 running at stock 3.5 gig and wanted to compare it against 2 later processors. The later ones are faster but not by that much. In the multi thread test the 6 core box is a lot more powerful which would normally be expected.
CPU-Z Benchmarks
CPU-Z Version 17.01.64
Intel 5820k @ 3.3 gig
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single Thread 392
multi Thread 3023 6 core
Intel 4770 @ 3.5 gig
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Single Thread 421
Multi Thread 2069 4 core
Intel 3770 @ 3.5 gig
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Single Thread 401
Multi Thread 1843 4 core