The S20 Ultra comes with a dedicated ultra-wide lens that can capture a 120° field-of-view. There's still obvious barrel distortion at the edges of the photos, but I find that it creates gorgeous, dramatic photos that look very appealing. There's no mistaking whether or not a photo was taken with the wide-angle lens, and I think that's part of its charm.
It also manages to capture good details and colour, particularly when the lighting is good. Maybe they won't look as good when you zoom in for closer inspection, but the whole point of an ultra-wide lens is the unique perspective it delivers, and I really like it.
While the highlights behind the skyline in the picture below are blown out – this actually happens a lot – the S20 Ultra ultimately produced the cleanest image of the lot. However, there are still some caveats attached to using the ultra-wide lens, especially when the lighting isn't quite ideal. In these scenarios, the camera starts to rely on slower shutter speeds, which can mean blurred photos if you don't have steady hands or there are moving subjects in the scene.