Taken from our very own W1zz review
Anything above 1920x1080 is just not worth the premium
You really gonna look at one bargraph and argue with someone who actually owns both systems with those exact same specs...
https://m.hardocp.com/article/2017/05/26/definitive_amd_ryzen_7_realworld_gaming_guide
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For a moment let’s boil everything down in real simple terms to the results experienced. We will then get granular, and dissect things more closely.
Overall, the Intel Kaby Lake 7700K CPU at 5GHz Z270 system provided the highest performance while gaming. Didn’t matter if it was single-GPU, multi-GPU, 1080p, or 1440p, or 4K, the most wins (at least in terms of raw data) are with the 7700K at an overclocked 5GHz.
Overall, the AMD Ryzen 7 1700X at an overclocked 4GHz provided the same performance and gameplay experience as the Intel 2600K on Z68 at 4.5GHz. It was most competitive with the 2600K CPU with both overclocked to the highest levels.
In terms of gameplay experience we felt the 2600K and Ryzen CPUs "felt" the same while gaming in single-GPU at any resolution. We "felt" the 7700K at 5GHz had an experience advantage at all resolutions, and especially with multi-GPU CrossFire."
Look at other reviews as well - at high FPS, you can feel a noticeable difference even at 1440P. (writing this on my 1700 right now)...
I have absolutely no motivation to mislead or cheer for one team over the other - just stating my experience - that 1700 is barely enough for that 1080ti and the 8700k beats in just about everything except $/performance - the guy is sitting on a 165hz monitor and a 1080ti - that is a no-compromise system (ie. he is willing to pay for the best performance), and he will see and feel a difference between the two setups especially after overclocking - especially so when he upgrades to the 2080/2080ti in the next 9 months or so.