I'm about 115 WPM on QWERTY. I learned Dvorak about four years ago and got to about 80 WPM. If I kept going I think I would have eventually slightly surpassed my QWERTY speed.

However, what I found was Dvorak is designed for English; it predates programming. Most programming languages are designed with QWERTY in mind. I think Dvorak made that harder, not easier.