The vivo X300 Ultra is being reviewed for its camera capabilities, with its main camera able to shoot up to 8K video and its selfie camera capable of 4K at 60 fps. Reviewers are praising the phone's photo and video quality, with some considering it one of the best camera phones available. The phone's camera capabilities are being compared to other high-end devices, including the iPhone, with some outlets noting its potential as a challenger in the market.