Portrait video works perfectly fine on my Galaxy S23 Ultra like in any of my other Galaxy phones with the feature. It's better than on the Pixel 7 Pro firstly because it's up to 4K 30fps unlike on the Pixel 7 Pro which is still just 1080p. Secondly, the Pixel 7 Pro doesn't have portrait/cinematic video on the front facing camera and thirdly, unlike Galaxy and iphones you can't adjust the level of bokeh. I hope Google fixes that with the Pixel 8 series.