They don't seem to publish ALL the information they receive (Surkov emails aren't featured on Wikileaks, for example), the screening and vetting process for leaks is intransparent and ad hoc. Given their position and renown, it's difficult to imagine that they haven't received any serious leaks from Russia or China, for example, yet there isn't anything on WL for those countries with any teeth on it.

Were they even in possession of the Surkov leaks? Seems like the hackers published it themselves, and never sent it to Wikileaks at all. It might be difficult for you to imagine they haven't received any 'serious' (I'm guessing you're not counting the Russian Spy Files or the Tibetan dissent videos as serious) leaks from Russia or China, but that doesn't prove much.

When I say “it is difficult to imagine”, what I mean by that is that it is highly unlikely, especially considering how Assange has a history of withholding leaks from publication for his own reasons. Conflict with Domscheit-Berg being pretty indicative of this behaviour.

The Spy Files are not really ground breaking for the Russian public. The Panama Papers were more damning, where a bunch of Russian officials got caught with their pants down. You know, the leak that the official WikiLeaks twitter account claimed to be a Soros-funded conspiracy...

IIRC the conflict with Domscheit-Berg was because Assange wanted to publish the war logs unredacted, no? It had nothing to do with Assange withholding leaks, quite the opposite. And wasn't it Domscheit-Berg who actually deleted unreleased documents from the Wikileaks servers?

Well, it was a bit more complicated, because there wasn’t any transparency in what leaks WL was in possession of (only Assange held such info) and because Assange published information that had little public relevance, but brought him fame.

Also, not really clear why WL would attack Panama papers...