Yeah, I saw it Friday. I went with one of my shooting buddies and his girlfriend. When we first saw Eames he looked at me and said that it was a Sig. He's been wanting one bad but hasn't saved up enough yet. The guy toting it in the movie was a bad-ass with it.
I also noticed the other day while watching The Professional that in the scene when the SWAT team is in the hallway outside of Leon's apartment that at least one guy had a Sig 551. You can clearly make out the handguards and diopter sight.