Better comfort, better sound, for me they were cheaper. They are generally compared with the HD598 and Fidelio X1 which are both better than the 558. However if you're in the US I'd just go for the 558 because the AKGs are a lot more money over there.
I only paid £112 for my 612 pros.
I see. Do you use them for gaming too? I don't think I've seem someone recommend them before for that but they're roughly the same price as the HD 558 where I live so I'll definitely consider them if they're better.
For sale section? But Amazon doesn't ship them to europe so I'm not sure how that would be different. >.>