I had been a fan of the US The Office for a while, having seen most of that before I started the UK one. First and foremost, I could not STAND David Brent and it took me three tries to get through the first episode. But I'm so thankful I kept going. This show is absolutely brilliant. If the US Office is Malcolm Gladwell, an affable and frizzy haired intellectual, the UK Office is Stephen Hawking, absolute genius.
The UK Office is borderline dystopian-from its grungy neighborhoods during the opening titles to the nearly SS Officer in Gareth-and showcases the absolute worst that work culture has to offer, much more so than the US counterpart. And in doing so, achieves a seeming truth that few shows could ever aspire to reach. Yes, the US version is a bit sillier, goofier, happier because it aims for laughs, even if subdued, the UK Office just lets the characters be themselves without a safety net: they're allowed to fail much more miserably than the US characters ever did, and in that, we find sharper humor and more vicious bite.
The closest the two shows ever came was arguably seasons 2 and 3 of the American version, where those characters were operating at their peak and the humor was witty and clever, but even still, the UK version, while missing some of the heart, pushes the envelope of allowing characters to be the worst versions of themselves much more than the US show. And it's in that where the best humor lies.