Devil's Canyon i5 vs i7

Hi… I’ve already got an i5 DC with an M.2 PCI x4 SSD and a normal SSD… So, its pretty fast… But, my question is has anyone got any experience with the build speed improvements moving to an i7 DC? My i5 is at 4.2ghz but the i7 dc starts at 4.0 so I am sure I could do some pretty good OC. I guess my question is… Does UE4 use the hyper-threading well? Or, would you just stick with the i5? Thanks…