There has been an absence of real world samples of the OnePlus 8 in slow motion due to mainly of the hardware not reaching testers fast enough and the COVID 19 pandemic slowing things even further. However, we have found a video that shows the OnePlus 8 Pro being compared to the Samsung S20 Ultra and the iPhone 11 Pro in the 240fps slow motion mode.
It is clear that the OnePlus 8 has a more processed image with higher saturation and apparent detail retention. It is also notable that dynamic range seems to be a winner in the OnePlus as well. The quality offered by the new handsets from the Chinese company is really astounding considering more expensive phones simply cannot seem to fully compete here. While more samples are needed the footage below shows a good enough view of what you can expect.