This is somewhat going to depend on what headphones you're going to run, but, in general I would say that Jotunheim is closer to the Pro iCAN than the iCAN is to the WA5-LE (at least with the tube complement I'm running). To be specific I'd have to do the back-to-back testing with the Woo - but it was an apparent enough difference that I wasn't left in any doubt about it. The usual curve of diminishing returns means that's a little surprising for me, as I'd generally expect the differences to become a lot smaller as we go up the food chain. But, again, I think this is more indicative of how absurdly good value Jotunheim is - it's seems to have the potential to be one a genuinely disruptive product. Pro iCAN vs. Raganarok? More about taste/signature preference and what features you need than anything else. I think there's more than a couple of percentage points of available performance above the iCAN or Ragnarok if you've got TOTL headphones, but I'd be coming from the tube side of things in making that statement ... what can I say? I like tubes with headphones. I'd definitely recommend comparing them yourself if you have the ability to do so.