Read this:
https://arstechnica.com/gadgets/2017/01/intel-core-i7-7700k-kaby-lake-review/
"Intel's Kaby Lake Core i7-7700K is what happens when a chip company stops trying. The top-end Kaby Lake part is the first desktop chip in a brave new post-"tick-tock" world—which means that instead of major improvements to architecture, process, and instructions per clock (IPC), we get slightly higher clock speeds and a way to decode DRM-laden 4K streaming video. Huzzah.
For the average consumer building or buying a new performance-focused PC, a desktop chip based on 14nm Kaby Lake remains the chip of choice—a total lack of competition at this level makes sure of that.
But for the enthusiast—where the latest and greatest should perform better than what came before—Kaby Lake desktop chips are a disappointment, a stopgap solution that does little more than give OEMs something new to stick on a label in a 2017 product stack."
Kabylake has some slight improvements in the laptop line, but for desktops, it has almost nothing to offer over Skylake.
"The quad-core i7-7700K, which sits at the very top of the Kaby Lake lineup, is less interesting. Compared to the sixth-gen i7-6700K Skylake processor that preceded it, the i7-7700K gains a small bump in base and boost clocks to 4.2GHz and 4.5GHz respectively, as well as the deceptively named Intel HD Graphics 630. The latter, while new in name, is largely identical to the Intel HD Graphics 530 found in the i7-6700K. There are no major architectural changes, and it runs at the same 1150MHz clock speed. What you do get is support for 4K media decoding inside Windows 10's PlayReady 3.0 DRM, which makes 4K Netflix possible on PC."
In fact, some think Intel's desktop performance arguably taken a major step forward since Broadwell, over four years ago.
Say what you will about Apple, they don't usually release a new product that is the same as the old product with a new label on it.