Depends : there are 2 versions of the bridge pickup, there's the regular version and the hot rodded one that's over wound to about 10.5k (I believe they call that the custom bridge version).
Either way. They are on the pretty low side of things. If you want to think of them as an aged set of SSL1s (which they basically are) then they're just about the lowest output/most vintage Strat pickup.
There are SSL5 which are beefier, but not hot enough to kill the single coil vibe. the SSL4 (quarter pound) which are even beefier, and with those you're starting to get more into a humbuckery sound just due to the amount of turns on the thing. and the SSL3 which are scorching hot.
If you have the custom bridge version of the Surfer II set, I think that sits on about the same level as what the SSL5s put out, but the EQ is still a bit more vintage chimey rather than the more modern SSL5 sound.
The only other standard single coils I really have experience with are the modern stock Fender USA ones which I would say are pretty similar in output and tone to the SSL5s