Isn't Ketchup pretty much one of the best Sektor players? lol.
Anyways, I do agree that a defensive Sektor can be a pain the ass. Far away, Sektor may not be able throw a missile without getting severely punished, but Smoke has absolutely no options. Smoke bombing to build meter or using Smoke Away too much will only get him tele-smacked into a full combo. Getting in is, of course, the hardest part of this sort of match. That said, if you do manage to get in, attack, and get the health lead, the Sektor player will undoubtedly start approaching faster and becoming impatient, which will lead to slip ups.
Personally, I consider it a 5-5 matchup.