I've been playing my US Standard Strat quite a bit recently. The single pickups are each fine and have a recognisable tone. Position 2 (neck and middle) is... well OK, a bit country, fine as a clean sound but not a patch on the neck alone. Position 4 is just mud when clean, all the high is gone and is unusable for me. Oh and they are both useless with any drive.
I've only the one SSS so nothing to compare to - is this my guitar or just reality? BTW Each pickup on their own to my ears has the same perceived volume output.