I own both a 8320 and a i5-4690k
I'll tell you the difference
-newer chipset on the intel board = faster boot times, so this is a plus
-lower power usage on the intel system (it's not as huge as some people make out but it is a difference)
-lower heat from the intel system = quieter system (this simply isn't debatable, if noise is a concern you build an intel)
-in gaming on a 1080p 60hz monitor you will notice ZERO difference. your monitor's refresh rate is the bottleneck not the cpu.
-around 4.7ghz or so, AMD cpus are basically indistinguishable from intel on 60hz monitors 1080p and larger, i couldn't tell you the difference and i own both
-if you stick an ssd on both systems, they'll basically fell identical in windows (zero difference, again, I can't tell so you won't be able to tell)
-if you have a 144hz monitor you WILL tell the difference, the intel will perform much better
-if you're not overclocking you WILL tell the difference, the intel will feel snappier in pretty much everything
-if you're multitasking (serious multitasking, like professional video editing plus running a virtual machine... ect) you'll think the AMD is the superior system. Now before the intel fanboys lynch me let me make myself clear. I am talking about running VMWare, with a whole other OS running in the background doing it's own thing at the same time i'm doing either work or play on the computer. The 8 core fx slaughters the quad core intel in this situation. i know i'm a unique user, but the difference is obvious to me. Even without vmware running, there are times when serious multitasking the fx cpu simply is better.