The riding by riding votes are here if you want to see them, but that's unrelated to my argument. The BQ got 10% of the popular vote in the last election, which means they would have gotten 31 seats in this parliament if we used rep by pop. Instead they got 49 seats. This was not a fluke either. The BQ almost always wins more seats than they are entitled to under rep by pop. And most of the time the number of extra seats are quite high.
For this reason alone, the BQ would fight tooth and nail against Rep. by Pop. (or the related MMP).