The 3770 is a little more powerful stock (figure about 7% more). However, the 1400 is unlocked so you could throw a slight overclock on it and it would close the gap or even exceed the 3770 FOR MULTI-THREAD AWARE APPLICATIONS. However, single core of the 3770 will be tough to beat with the 1400, so gaming performance "could" be better with a 3770. That said, if any, you're probably talking about 1-3FPS. The ryzen could even be better due to newer and more advanced processing architecture in general.
Ultimately, you wouldn't be doing much of an upgrade jumping to a Ryzen 1400 from a 3770 from a CPU perspective. Your benefits of making that jump would just be in features like gaining USB 3.1 (pending the motherboard) and NVMe...