u/FlyingSpaceElephants

So I'm looking to get the M43 body and I'm wondering how big the difference is between these two cameras? I know they have the same sensor so image quality wise they're the same, but what about other things like auto focus and so on, is there a big difference there?

A used EM-5 iii is obviously cheaper than a new OM-5 ii, but with cashback and kit deals the distance becomes less, and you also get nice things like warrant, so I'm wondering if it's actually worth buying new?