YoAndy :
The difference banishes completely because the GPU is the bottleneck, Once new generation of more powerful GPU's start rolling out, we will see Ryzen chips fall behind in 1440p just like they do in 1080p. Is not rocket since if they are behind intel in 1080p they will be behind at 1440p and 4k once we get the newer generation of more powerful GPU's. Meaning new Ryzen CPU's will not last you as long as Intel's CPU's. For the money now they are a great buy, I personally have a Ryzen 7 1700 on my wife's PC, it is a good CPU but when it comes to gaming my first generation 6 core i7 990X @4,5 GHz is a bit ahead(note it was released in 2011) but at the end you get what you pay for. I'm not hating on AMD because they are doing a lot of things right and they have come a long way, they are close, but they are not quite there yet. They are great budget CPU's..
Said new generation of GPU isn't quite there yet - and by the time it is, maybe Coffee Lake will actually be available - and Zen+ will be there too.
A while ago, I did a small test on Bioshock Infinite where I voluntarily limited CPU performance (Athlon X4 620, no L3 cache, 1333 MHz DDR3, 2GHz EMC) and compared 2 different modes that theoretically have the same amount of instructions processed per second:
■ 2-cores, fixed 3.2 GHz
■ 4-core, fixed 1.6 GHz
This was under Linux with details at minimum and OpenGL threading enabled then disabled in each mode. I used a semi-scripted scene at the end of the game for ease of reproducing the scene (Elizabeth opening the door to the lighthouse) and I made use of the display driver's embedded HUD to capture CPU use, frame rate etc. graphics.
Without surprise, the 2-core 3.2 GHz, OpenGL threading disabled mode had higher max FPS . However, gameplay in 4-core, low clock, OpenGL threading enabled mode was much smoother - max FPS was much lower (half as much, in fact - 80 fps instead of 150) but min FPS was quite higher with much less spiking (4-core mode would never go under 25 fps, while 2-core mode would regularly dip under 15 fps).
Of course, it's an old game on (very) old hardware. I do think it's still representative of today's gaming environment (more limited tests on my 4.2 GHz Haswell i5 show a similar tendency).
My point is, while a Ryzen R5 1600 can be considered a "budget" gaming CPU, the fact is that it may provide a better gaming experience than any Kaby Lake (and older) i5 Intel CPU on reasonably-threaded titles, and actually compete with i7 processors on general gaming smoothness. Of course Intel leads the race in max FPS - but how much more do you need to spend on an Intel system before you get a frame rate with less variation, that you get with a $250 CPU at AMD's?