[Nautica]

I don't think Houston or Dallas are jealous of Austin.

Yes, its true that Austin's downtown area is more dynamic, with a core, which is both lively and profitable.

That being said, I can speak for Dallas in stating that they have many more residential towers than Austin. They might not be as tall but there are many more of them.
Speaking for height, there are several completed or in the works that are not too far off of the Austonian (683 ft.):

The Drever (625) Currently undergo renovation from office to residential.
Gables Republic (602) Transformed from office to residential.
Amli Fountainplace (562) Under construction.
Flora & Olive (441) Under construction.
Hall Arts (440) Under construction.

All of these are in the downtown core. I think most Dallasites and Houstonians are proud of the progress they see in Austin and only want to see it improve. There I said all that without any teeth grinding.