I don't know much about the threadripper, but lol according to these benchmarks, yes, yes its worthwhile to upgrade, especially if you got it for free.
https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-4790K+%40+4.00GHz
https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+Threadripper+1920X
Tldr: 8,000 vs 23,000 multithreaded benchmark score on cpumark