Your i7-7700K is already basically the best Intel KBL processor available. Only the KBL i7-7740X is better (and it's not Socket LGA1151 compatible), and only in a few parameters by a few tiny margins. Not at all worth the upgrade cost to gain so little, you'd be better off upgrading the whole mobo (with processor) from KBL to CFL (Z370/i7-8700K) - or buying a comparable Ryzen R7 platform - or waiting until Intel launches Z390 and Ice Lake sometime around 2H/2018.
https://ark.intel.com/products/codename/82879/Kaby-Lake#@desktop
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[/Korth]
