As it sits, I'm overclocking my 3900x exclusively with Ryzen Master, since these BIOS versions are so new even setting voltage within BIOS doesn't work, but Ryzen Master will.
I'm currently at 4.4ghz all cores at 1.285v.
Peak temps hit 67c, idle is 33c (it gets pretty warm here during Summer)
Also have a profile for 4.325ghz at 1.25v, those temps peak at 63c.
Granted, I am running a TON of radiator space in my custom loop. Even still, I am blown away at how quick these things warm up.
For context, I got my Threadripper 1920x to 4.225ghz with the same loop at 1.45v and temps never passed 58c.
I think there's still much to learn about this new gen Ryzen but also I too am anxious to see if a BIOS update will fix temperatures a bit like they did in the first gen Ryzen.