As usual, I'm basing this mainly on the latest Betfair odds to win, but have simplified some of the fractions.
Sam: 6/5
Gina: 11/9
Dexter: 11/1
Jack & Joe: 22/1
Hazel: 37/1
Charlie: 47/1
Sophie: 51/1
The biggest news here is that Sam's now favourite. He's not odd-on though, and it's very close between him and Gina and the moment.
Elsewhere, there are a few examples where Betfair diverges from the "proper" bookies:
Dexter's odds are much shorter elsewhere, and is 6/1 with William Hill.
Most of the bookies have Sophie as 4th favourite, either ahead of or level with the Twins. There does seem to be a trend against Sophie, though, and it's a toss-up between her and Charlie as to who's bottom on Betfair.
Also, Hazel's odds have shortened a bit on Betfair, possibly pointing at her popularity recovering a bit (she's third most popular HM on DS at the moment).