Finland has excellent eyesight (the best of them all in both short and long distance) but his sense of smell and taste is fairly poor. Hearing is slightly above average.
Norway has really good eyesight for long distance stuff but requires glasses for really close up reading or other minute tasks. He has an average sense of smell and taste, but his hearing abilities are incredibly good - hence why he likes peace and quiet.
Denmark has a good sense of taste and smell, with good eyesight. His hearing, however, is a little below average.
Sweden has terrible eyesight but really good sense of hearing. His taste buds and sense of smell are pretty lacking too (Surströmming anyone?)
Iceland has average sense of smell, a good sense of hearing and good eyesight. Taste-buds are lacking quite a lot.