$12,500 MSRP and only 72 units made according to that link. I have no idea what that dollar amount is today with inflation correction but $20,000 isn't unreasonable I'd hope.
It certainly screams "the best" by it's original price tag. Unfortunately, there aren't enough around, or enough willing owners to have it go to a head-to-head best-of-the-best competition for precision rifles that exist today.
This rifle was done 20 years ago. I would think rifles of equal accuracy or superior accuracy are available today at equal or lower cost. It would be hard to believe a benchmark (did this rifle even set some kind of benchmark?) set two decades ago hasn't been surpased by any firearm today, nor that no company has tried to break surpass it. Perhaps the high price tag will result in little or no sales and only serves as bragging rights. The highest priced rifles I am personally aware of are the DSR-1 and Accuracy International 50BMG models, the highest which run close to $15k.
I would go as far as saying there is more mystique than superiority on the WA2000...and yes, I make that statement entirely based on nothing. Yes, it looks awesome and I'd like one. But, I don't see any hard tests or evidence of accuracy of the rifle. I tried googling information but only found stories and no proof. "extreme accuracy" is a term one used to describe it but that is a subjective term.
One might never get an objective answer as the demand isn't high enough for someone with the monetary means, or publication powers to get such a comparison done.