Girlfriend flew out from T1 on Sunday morning in economy and from joining the queue to clearing all security and immigration it took about 15 minutes (arrived at about 8:30am). On the same flight last November on a Tuesday morning it took me a bit over an hour to do the same and that was flying business/using priority queue. I’m far from a ICN expert as I only fly through there a few times a year but it certainly seems a lot better than it used to be.