I love my Fili, but if I had to choose, I'd pick this Iberia. It feels great. The steel has that unique Swedish feel. Super super light and gentle feeling.
I'm not familiar with it either. The Fili double tempered steel is excellent. I bet the procedure is called something else today. I owe Tim Zowada an email. I'll ask.
Please let me know when you find that Iberia's twin! :)
Oh I'm sure Tim will have a good explanation. I'll be curious to hear it. Maybe it is about time I start educating myself more on the metallurgy aspect.