In discussions like these you should also remember that usually the journalists are quite significanlty more left-winged than the population as a whole, which of course also has an influence on the bias of the media corporations. 80 % of the Danish journalists, 77 % of the Swedish journalists and 57 % of Norwegian journalists votes for left-wing parties, so it would be suprising if something similar was not the case in Iceland.
These numbers might be a bit misleading however, when it comes to analyzing media bias. Among
political journalists (i.e. excluding sports columnists, celebrity journalism, etc.) there is not a left-wing majority. In both Norway and Sweden, political journalists vote, according to some studies as much/more right-wing than left. I haven't seen any numbers for Denmark, but wouldn't be surprised if the same applied there.