The design of electronics/avionics in the commercial sector in relation to EMC issues/requirements would follow similar methods to hardening it to EMP. Since EMC has come along way in the last 20 years, its likely that newer planes would fare better than older ones in this respect. (although older planes with no electronic critical system fare even better
As far as, will plane x survive, thats hard to say without knowing how close, what field strength etc, but this could be extrapolated from the EMC tests done on avionics at approval stage.