It depends on your idea of comfortable.

Some western foods for example are highly priced compared to local options: imported au/us beef is similar cost to Australia ($20-$30 a serve) but local "steak" is maybe $3 to $4 a serve. It also has the consistency of a finely barbecued shoe.

It also depends on the area. A lot of expats want to live in areas surrounded by other expats, so things are priced higher in general.

If you go live "in the sticks" ie you will stand out as one of few/only foreigners in the district, things can be cheaper (once people know you're a "local")

I would qualify spending $20 per serve on steak as bourgeois, rather than comfortable, at least if you're making a habit of it.

You can definitely live a very comfortable life in Thailand at about $1300. This includes swimming pool, gym, to-the-door food delivery, etc. I'm locals, though, so it might be a bit more expensive for expats.