691 was the mean for Haas this year so you're slightly above in that regard. If you come from an over represented demographic (think male Indian Engineer) you're definitely going to have some competition.
I do want to add, if you did decide to pursue a change of career, Haas has some great opportunities to get into IB and Consulting even for part-time students. While you'll need to quit your full-time job after your second year, the program office has a pretty rigorous program to help you make the transition.
UCLA also has the flex part-time MBA program with some of the classes online (hopefully I'm not completely mistaken here). While I don't know the full details, that may be a good option for you.
As far as career progression is concerned, an MBA from a prestigious program will only help you get the interview. Landing the job and working your way up the corporate ladder is 100% on you. I work for a very large organization and I've met plenty of people from lower ranked schools who greatly excel at their job. I've also met plenty of people from top schools who do not. It's what you do with your knowledge that determines how successful you become - hopefully this sentence doesn't come across as too cliche