I took a look at how Liga, Premier, and Serie A teams did against each other head to head in euro competitions this year and it was pretty much exactly dead even all 3 ways. Not sure there's a huge gap between the leagues anymore.
But ManCity does look a cut above the rest.
I do think that Inter is legit the best team in Serie A this year though, despite the standings, and they handled Spain's #1 team twice in champions league already, so I'm not sure this final won't be a tougher challenge for ManCity than this semi was.
Key for Inter is if talents like Lautaro and Lukaku can keep looking as good as they have recently - like the superstars they looked like a couple years ago.