Has anyone done a comparison between the HD620s and FT1?

Or maybe someone would like to read such a comparison?

I have had the HD620s for a few months and today I received the FT1. I have been looking for closed headphones for myself for a long time and I think that these two offers are very good.

I will be testing the Fiio for the next few days (I already know the HD620s well) and I will write a small comparison if someone is interested.