I upgraded from a 2500K @ 4.2GHz to a Ryzen 1700 @ 3.75GHz and honestly, unless you're doing content creation you won't notice much of a difference.
It's nice to have 8 cores/16 threads but with Threadripper coming out with 16/32 and am not so sure Ryzen 7 is as 'future proof' as it first...