The Finnish educational system is known for its equality. However, in many key areas in national and international assessments, Swedish-language schools in Finland have lagged behind their Finnish-language counterparts. So far there is little research into the underlying reasons for this discrepancy. In this article, in order to illuminate the phenomenon, we take a closer look at a number of school-level indices based on the Finnish OECD Programme for International Student Assessment (PISA) 2009 data and compare school principals' responses across these two school categories. Our findings reveal differences in school policies and practices, in school climate, and in school resources between the two parallel language-specific sectors of basic education in Finland.