I would argue it makes the comparison harder. You're not purchasing your goods in USD when earning in CAD, so converting to USD belies the (limited) buying power of the CAD. Many Canadians find living on $50,000 near impossible while others are quite comfortable. Someone living near High-Park in Toronto is likely to have a vastly different idea of how far $50,000 can go than someone living in Lucknow.
With that said, I agree that the pay levels of pilots in Canada are egregious when compared to our confrère.