I don't know any numbers but I would guess that Xbox is not close to being the market leader. Sony has that wrapped. Xbox is probably closer to Nintendo. They do, however, have a competitive platform which is important. Something they could never do with Windows Phone.
Video game consoles are technically 20th century invention. Xbox is just a continuation of that legacy even if the brand started in 21st
Xbox also isn’t top dog among the big 3. They’ve really struggled to ship big exclusive system sellers (which is a bummer. I’m a big fan of a lot of Xbox IP), so they certainly aren’t “industry leading”. Doesn’t mean the exclusives they’ve shipped aren’t good. They certainly are, just that their is no Xbox answer to God of War or Last of Us
GamePass is one of the biggest success stories to come out of Xbox and is certainly the dominant game streaming service