I've never been to KitKat, though I've been past it a few times. Given the reputation, I'd be surprised if they ever allowed cameras or devices with them.
They don't allow phones past the cloakroom in Kitkat, and pretty much anyone in there will immediately challenge anyone who sneaks one past. All the other clubs tend to just have stickers over the cameras, and will still kick anyone out who's seen to be videoing or taking photos.