Gabriel Knight is unfortunately in a category all its own.
The Broken Sword series are good, solid, adventure games and they should definitely be played if you haven't, but they are a bit more cartoony than the Gabriel Knight universe.
Syberia 1 and 2 are OK as well, but again, I wouldn't equate them with the Gabriel Knight series in terms of quality of plot and character development.
The only series which I think matches it in terms of sheer quality is the Longest Journey (altough it's obviously more of a straight fantasy than the GK series, but LJ at least matches GK in terms of story telling quality and character development--I think).
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