Next time I'm having a pee in a public lav, I'll remember that: "Bog Brother is watching you".
I think Kafka and Orwell are rather different beasts. As I always claim, the biography, nationality and background of a person is usually very relevant to their writings.
Orwell is greatly respected in Eastern & Central Europe for seeing through the rhetoric and lies of the Soviet system. He had his fill of Commies in Catalonia: they wanted to get rid of Franco, but then started their own purges in the ranks. But Orwell is still a bit of a Burmese policeman (maybe the r?gime needs a few now...). His humour points outwards - he is criticising Communism, something "out there" which didn't affect his everyday life once Erridge, as parts of him are called in the Anthony Powell novels, gets back to Britain. He was a good observer.
Personally, I think that while Animal Farm is a comic caricature, 1984 does examine the more creepy aspects of a totalitarian system, like thought control, censorship and state lies. And the erosion of private life. The last paragraph of 1984 is an excellent reflection of how people, after torture or mistreatment (e.g. a decade in the Gulag) ended up loving Stalin in the Soviet Union, because it was the easiest way out psychologically. Even today, there are veterans of WWI alive who think that the sun shone out of Stalin's arse. They cannot see that the Molotov-Ribbentrop Pact and the mass murder of key Russian generals by Stalin will have made WWI a much tougher fight. Orwell picked up this mentality and reproduces it well. Orwell is a good author to read when thinking about life in North Korea today.
On the other hand, Kafka's experience of the Yiddish theatre and the sheer absurdity of everyday life in the Austro-Hungarian Empire, gave him a more zany outlook on life. He is more the self-deprecating Jewish clown, like so many American comedians. Even at his blackest, Kafka is still somehow humorous. The Absurd is writ large in his books and stories. His take on all this is much more from the inside - he was living in Prague, not on Jura.