Kicked my ass
As previously said it is a big step forward from my Fidelio L1. Bass extension is better and in the meantime leaves more space to the upper mids so clarity is improved as well as soundstage and instrument separation without beeing analytic, tireing or sibiliant at all (same asL1). It remains fun to listen (pop, electro).
As a bonus, sound level remains good enough straight out of my iPhone (even if it's not a portable can that's an advantage to me)
Next question : will I keep my L1 ? I'm afraid I'll have to sell it even if I was really satisfied with it but it will probably stay in my drawer... I'll stick with my UE700 iem as a portable device