I thought the factory edge on my Dragonfly 2 WC in K390 was better than on my Ladybug and Stretch 2. Both had either dull spots or a really tenacious burr.
I cut one day with the Dragonfly and boom, I could see a clear and pretty big burr going out of alignment with the Apex. These burrs aren't easy to detect, cause cutting in a bit of wood or some paper won't necessarily displace them. From what I experienced of course, and I'm only talking about K390 factory burrs.
So I spent a lot of time to do what I was gonna do anyway : Reprofile the blade to 13/13,5 dps. I had not tried a really high polish on K390 yet, and decided to double down. Actually, let's also sharpen to the heel.
The bit of smile you see is my fault, the wharncliffe profile wasn't totally straight, and I spent a little more time at the heel to manage to hit the part that is like 1 cm from the heel.
Here's a first attempt at posting a video, dunno if this works here (edit: it does not work with imgur):
https://i.imgur.com/v5heq9q.mp4
I have to say one thing : The bite K390 keeps at a high polish is astonishing ! This is the first time I really get to experience this steel fully (Ladybug lost a good part of it's lifetime, and now I'm waiting for it to get dull, I changed angle 3 or 4 times already, and Stretch hasn't seen much use). Hair either jumps in fear of the edge, or get split in two.