I would appreciate any suggestions for works by other Chinese science fiction authors, as I understand that it's not fair to judge such a vast culture based on a single data point.
I should also add that as reasonably hard sci-fi goes, the very notion of "sophons" (and their mechanics) as presented are not even wrong. In general, when it comes to most sci-fi elements of the book aside from the titular concept, it felt like someone just clipped whatever sounded cool from a popular science magazine and then tried to write a segment of the story around it - i.e. some things, like nanowires/sheets, are introduced not because they make sense in context, but solely for the cool factor.
We'll never know who would have won in the absence of all that ballot stuffing.
The list was:
https://www.thehugoawards.org/hugo-history/2015-hugo-awards/
The Three Body Problem, Cixin Liu, Ken Liu translator (Tor Books)
The Goblin Emperor, Katherine Addison (Sarah Monette) (Tor Books)
Ancillary Sword, Ann Leckie (Orbit US/Orbit UK)
Skin Game, Jim Butcher (Orbit UK/Roc Books)
The Dark Between the Stars, Kevin J. Anderson (Tor Books)