How well does the AT2020 record vocals?

Answer 1

There's a lot more to recording vocals than just the mic. But assuming you have all other variables in place and of reasonable quality -- preamp, recording medium, engineer (or engineering, if you're doing it yourself) and most importantly a good singer -- you should be able to get a good recording out of it.

That said, it would sound just as good (or bad) as most other condenser mics in its price range. I personally would go for the Behringer B1 or if budget permits then the B2-PRO; sure, they're kind of bright, but do really well on vocals, acoustic Guitars, and as room mics.