ps. see comment below, it was the work of multiple architects
The first problem with Brasilia is that it's horribly located. We did avoid the Stockholm fate of having our historical cities razed, but moved the seat of power to the middle of nowhere. I know that overpaid lower-ranking bureaucrats have houses in the outer rings, near the lakes; but no one who has an actual choice lives in Brasilia. I don't know if it fully qualifies as a city. If the capital ever moves, it will be a ghost town in three weeks and start crumbling (bad architecture and bad construction) within the year.
The capitol complex really settles the arguments. You have the NYS Capitol, which is an amazing expression of the excess of 19th century monumental building. Across one street is a circa 1910 replica of a Greek temple turned office building, with a gross 1950s addition in the rear. Across the park is an Art Deco mid rise, and then you have the Empire State Plaza, which is an interpretation of Brasilia in the US.
It’s designed as an over proportioned Roman forum built on a parking garage and mall-like concourse, but the buildings themselves are bizarre. Full of little warrens, and dependent on chaulk and constant maintenance to endure.
The architects sold the place based on the modernist form, but the building interiors are really not designed for their intended use. Function always follows form in these sorts of buildings.
Few know, but Islamabad is also began its existence as a 100% planned city. Pakistan invited C. A. Doxiadis to do the planning https://en.wikipedia.org/wiki/Constantinos_Apostolou_Doxiadi... . He was considered to be of Corbusier's calibre if not more, at the time.
Faisalabad was planned back in British time. And the now infamous Model Town, as the name suggests, too.
Dhaka, and Karachi were also supposed to get plans at around late sixties, but we all know how it went...
Diodiaxis left Karachi plan half finished when 1971 happened, and Dhaka had an initial burst of orderly development for a few years, but it was cut short after Mujib was murdered, and 20 years of instability followed.
Karachi, and Dhaka now are prime examples of "urban hells" in the world.