There has been a huge surge in awareness of btc starting in October because it has had so much coverage by the press and by nbc. If you work in an office, you problably have a coworker or two who is secretly into btc. Almost everyone I mention it to nowadays at least knows that bitcoin is "that alternative form of money". However, awareness and taking an interest are two different things.
This is about what my anecdotal evidence would support as well. Almost everyone in here is familiar with it now though, after I told them in April and then some dabbled a bit and everyone paid attention in October and since.
I would be surprised if more than 1 in 20 (maybe higher) in a professional environment actually have any, though. I'm shocked to be in the tech sector and see so few who have some BTC.