GN released a new video last night comparing the performance of i7-6700K and i5-6600K against newer CPUs. Basically, if you're still on i7-6700K and only play games, you are not losing out a lot. If you're on i5, then may be consider a new build or upgrade to an i7-6700K if you can find one cheap. Interesting, he only recommend doing so if you can find it for $50USD which is not possible. If you're using any kind of productivity software, best to upgrade.