Multilingual sentiment analysis attracts increased attention as the massive growth of multilingual web contents. This conducts to study opinions across different languages by comparing the underlying messages written by different people having different opinions. In this paper, we propose Sentiment based Comparability Measures (SCM) to compare opinions in multilingual comparable articles without translating source/target into the same language. This will allow media trackers (journalists) to automatically detect public opinion split across huge multilingual web contents. To develop SCM, we need either to get or to build parallel sentiment corpora. Because this kind of corpora are not available, we decided to build them. For that, we propose a new method to automatically label parallel corpora with sentiment classes. Then we use the extracted parallel sentiment corpora to develop multilingual sentiment analysis system. Experimental results show that, the proposed measure can capture differences in terms of opinions. The results also show that comparable articles variate in their objectivity and positivity.