IPC performance has improved greatly with the ZEN architecture. About 40% better compared to their previous architecture, but not quite as good as intels current generation. though I doubt you would FEEL a difference. this is more something you would notice in benchmarks. IPC performance of Ryzen is certainly better compared to your current Core i7 920.
also read what I wrote about the X399 platform over here.
EDIT:
Here are some rendering Benchmarks: