On the HN/startup crowd note, that includes mandates that business in the office be generally conducted in French if you have 25+ employees, and there's significant enforcement powers to those mandates now.
Beyond that, the economy has lagged that of other provinces over past decades, although in recent years that's been less true - remains to be seen if that performance is a break with the long-term trends or not.
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More subjective:
It's generally going to be the "big government" model. Highest taxes on high earners in Canada, generally a reputation for more social services, more regulations.
Climate's pretty rough to many, although not extreme by Canadian standards. Still, it's a big difference from Southern Ontario or Vancouver.
Montreal is basically the only major "world" city, Quebec City is about the only other one of some national/international significance.
While it may look big on a map or as a number, in reality nearly the entire population lives in a relatively small corridor and much of the land area of the province is virtually uninhabited and in many cases basically inaccessible short of a helicopter or serious wilderness expedition. It will not feel anything like being 4x the size of Germany even if it technically is, for an example.
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Anyway, the power is cheap because it all comes from large hydro plants up north, they're blessed by geography in that sense.
Thank you!