cpu->intel i5 7500
gpu->msi gtx 1070ti
ssd->Transcend SSD220 240GB
ram->Patriot PSD48G240081 2x8GB
Is it worth upgrading to a i7 7700k?
I use it 85% for gaming and 15%browsing watching videos etc.
thanks in advance
Will broadly depend on what sort of games you play. If limited to single core then it won't be a significant upgrade. If the games you play are dependent on higher thread count, then you should see more benefit.
Whether it's worth it is for you to judge on your own expenditure.