Thank's for the replies everyone. I feel somewhat confirmed in my first assement of Hapkido based on the www. It seems to me that both are interpretations of a somewhat common background. One with a lot of emphasis on small movements effective for self defence - one with larger movements searching to take care of the attacker if possible.
The rest of the comparisons seem to differ based on what kind of style within the systems one practices. I think on a line from very combat focused to very soft both arts will scatter across the line - however with a bit more aikido towards the combat end of the line and vice versa.
I now have a understanding of what I should expect to deal with, if a former hapkido student shows up for aikido class