I'm currently running on a 3800x which has been perfectly fine when using handbrake on 1080p files, it usually take me around 60-90 minutes to encode a film.
However, I'm just getting into 4k files and am trying my first film tonight, Warrior, which is 68GB. It's been running for 1.5 hours and says it has 10 hours left

My question is, would I see a noticeable benefit to upgrading to a 3900x? Does anyone have one and can they comment on how good it is when using handbrake?