Looking at the MLS data, there are exactly 3(three) -2 bd condos sold from January 2012 to August 2012. The average sales price of these condos was $758,612. There is also one on the market right now, you should check it out and follow the final sales price. It's listed in mid 800k's.
There were probably more than 3 condos sold in Buena Vista/Haight Ahbury this year, but they are off MLS.
The lack of appropriate comps always makes refinancing difficult. Some appraisers may look into the MLS sales and also title/tax records sales, if they don't have enough data. However, even if the market is trending up, appraisers could be very particular about values for refinancing purposes, which could come in lower than if you decided to sell your condo. I understand why you are reluctant to start the process all over again...
I would be happy to help should you need further data.
Alina Aeby -Broker Associate DRE#01729889
Pacific Union International/Christie's International Real Estate