For hobbysists? Likely not much, other than familiarity with an industry standard renderer (though not as popular as it once was). For professionals, you get q

For hobbysists? Likely not much, other than familiarity with an industry standard renderer (though not as popular as it once was). For professionals, you get quite a few things but speed optimizations (resolves faster in my experience), render quality (usually fewer fireflies in my experience) and some more advanced transmission models to name just a few.