Google's HTTPS algorithm went live earlier this year and many sites did switch over to the from their HTTP to HTTPS counterpart.
So now SEOs and Webmasters are asking, should we ask people to update their links to the web site. So if they are linking to our HTTP version, should we ask them to change the link to the HTTPS version?
Gary Illyes from Google said, "it's not worth it." He said the difference is so minimal, since you have the redirects in place, that you can be doing so many other important things to make your web site better than go around asking people to add an S to the HTTP of your links.
Gary said on Twitter:
if your redirects are properly implemented, the benefit from doing that is so minimal that IMO it's not worth it.
@pip_net if your redirects are properly implemented, the benefit from doing that is so minimal that IMO it's not worth it.
— Gary Illyes (@methode) July 7, 2015
There is the concept of redirects having link dilution but Matt Cutts said the PageRank flows evenly.
Forum discussion at Twitter.