should i upgrade my current system to a new one?

[chris78]

this is my current system

asus z97 maximius ranger iv
i5 4690k@4.5ghz
cryorig cpu cooler
16gb corsair 1600mhz ddr3 ram
xfx 850 watt psu
msi gtx 1080
soundblaster zx soundcard
roccat isku keyboard and roccatt kone xtd mouse

my question is should i upgrade my processor to the new coffee lake like a i7-8700k and a new z370 motherboard and ddr4 ram?

 

[kajjot]

In short - NO.
If you are experiencing slowness in any games then monitor resources to see what is causing a bottleneck.
4690 is still a very fast CPU and DDR4 doesn't really bring any benefits.