Yes, absolutely.
That information, which many people are interested in, is available in the data from censuses prior to 2011. It can be found in the National Household Survey, from which income information will be published in August. It is possible to determine average income by industry and professional sector.
In fact, it must always be understood that several factors are involved. Frequently, it is not so much bilingualism that influences income levels as the use of both languages. When you compare people who are bilingual, those who are required to use their second language at work generally have higher incomes than those who are bilingual but do not necessarily have the opportunity to use both languages in their workplace. That information is indeed available from Statistics Canada sources.