By gut feeling I’d agree on Chrétien, and there is some polling on this (which I think backs that up). This article compares favourability after first election for PMs going back quite a ways and Carney looks similar but slightly worse off than Trudeau or Harper.

https://angusreid.org/prime-minister-mark-carney-first-month...

Justin Trudeau when he was elected was the most popular politician in the country by a lot.

Justin Trudeau actually appealed to many younger Canadians as well, until he severely didn't, but that's how he got elected afaik. I don't think the numbers are out yet, but it was largely boomers who voted Carney in, everyone else that I've spoken to under the age of 40 is like "meh", and some regret voting him in after the Liberals' predictable reaction to the Air Canada strike.

Much like the rest of the g7, we have an aging population and a mega generational class divide. Our youth unemployment rate is high, jobs have dried up, it's a shitshow, and Carney hasn't tried to address this much.

So whether he's popular or not needs more context. He'd certainly be most popular with the richest and most populated generation ever, and potentially business owners, but we'll see.