Now that the season is over, I decided to count all the stage winners:

Martins Sesks 17
Hayden Paddon 14
Oliver Solberg 10
Yoann Bonato 8
Andrea Crugnola 8
Mads Ostberg 7
Miklos Csomos 7
Craig Breen 6
Erik Cais 5
Jan Kopecky 4
Andrea Mabellini 4
Mikko Heikkila 3
Robert Virves 2
Jan Solans 2
Simon Wagner 2
Miko Marczyk 2
Ricardo Teodosio 1
Adam Brezik 1
Simone Campedelli 1
Alexey Lukyanuk 1

I didn't double check it, but you get the overall picture.
Points of note:

Solberg got the third most stage wins from participating in just a single rally;
Breen would have definitely been up there;
Paddon had a very consistent and strong season without pushing when he didn't need to;
Former champion Llarena did not get a single stage win.