If you play 1 Charakter 3-4 Hours on every day. You can farm maybe Amu's and Runes for 1 Charakter with Premium!
If you play 1 Charakter like 6-8 Hours on every day, you can farm the amu's and Runes without Premium, i dont know.
But, If you want to play more charakter, you cant farm this Runes and Amus. I Play much Games with 2-3 Charakter and Premium. And i got enough mats for Runs and Amu's for 2 Charakter...
And Mindhunter, you have 5-6 LvL 20 Fullgear char's on EU Server, and you pay Money !! If you say, no its a lie.. Sry

In Panzar Equip over all, and with the new Crafting system, you need more then 20 Day's for Full Equip. In This 20 Day's you get Reped

Its true, we can change Runes in the new Crafting system, thats great. But you cant farm more then 2 Chars with Premium. Maybe 1 Char without Premium, but you must play alot, and you cant waste your Pots. With Premium, i must buy some Potion's ;(
Maybe you got more Ressources on LvL 30, but on EU Server its imposible to farm all without Paying .
Without Premium you can Craft only 1 Armor . LvL 16-20 Armor need 1-2 Day's. Epic 4 Day's.
LvL 28 Epic need 8 Day !!! Normalgear like 2-4 Day's, and this with 1 Slot

So yes, you can farm it without paying, but you need much much much time , in this Time you play vs full geared People, this make no fun.
It's like p2w.
Real f2p Games are Smite,Dota or LoL. In This games, you can Spend Money for Style but not for Gear or Upgrades.
This is a PvP Game, and you can Buy Armor Amu's and Pot's for Real Money , so tell me this is not P2W?