What are the specific side step minimums for an approach?
KSFO has sidestep minima for ILS/LOC 28R to 28L but not from ILS/LOC 28L to 28R.  It also has a sidestep from ILS/LOC 19L to 19R but no ILS at all for 19R itself.  The latter is probably the more normal case for sidesteps: giving a second runway (probably one normally only used for departures) lower minima than circling without needing to install and maintain another entire ILS setup that would rarely be used.  Notice that the first two also have (much higher) circling minima.

KDFW has sidestep minima for ILS/LOC 35L to 35C, ILS/LOC 35C to 35L, ILS/LOC 36L to 36R, ILS/LOC 36R to 36L, and all their opposites.  Since all the sidestep targets have an ILS of their own, this seems to be intended only for when one of them is out of service, i.e. not for normal usage.