Majority of transcripts are from sense strand?
From my understanding sense and anti sense is contextual. If you are looking at a gene from 5'->3'(which is convention) that strand is the sense strand and the complement to the gene is the anti sense strand. 

However further along the DNA there could be a gene on the 'original' anti sense strand, if you are discussing this new gene, there is a new context and it is now on the sense strand (oriented 5'->3'), and it's complement on the anti sense strand.

I hope that's clear.