The translator at the centre of the case was found guilty of possessing child pornography after downloading the offending manga images from the internet. He told the court that he had retrieved the 51 pictures in order to stay up to date with the latest developments in the Japanese comic genre.
Sounds like he's just some fan. Even if not, he did it privately, apparently.
Now, I'm no fan of loli H, but it's hard to say whether this guy will get convicted or not. First, it's Sweden, so their moral deliberations are less knee-jerk than that of Americans. Second, and more importantly, the law against CP was drafted to protect children - that is, children in CP are being exploited, so it aims to stop that exploitation. In the case of the manga, no children are being harmed or molested in any way.
So it really comes down to a freedom of speech argument... although one could still argue that the comics are demeaning and undermine children's rights. *shrug*