I have a Ozone 12m Hyperlink Ultra light version and today had the chance to demo a 12m Flysurfer Soul with a view to making a comparison.
Wind was about 10 knts with nice flat water and I was on a Jshapes freeride foil with a Jshapes 120 cm board. I've had quite a few sessions on the Hyperlink and have become very familiar with its attributes.
The first thing that struck me about the Soul was it seemed more solid or more pressurized than the Hyperlink. It was less prone to allowing air to escape which results in a wing that deforms less during flight which translates to a more even/less broken power delivery. It would also follow that more relauch time is available if the kite ends up in the water. Fortunately I wasn't required to test that aspect. The soul definitely seemed more powerful than the Hyperlink and developed more speed and a higher upwind angle. Water starting was easier with the greater power delivery. It was however slower moving and less agile than the Hyperlink which slightly put my timing out for boosting and backrolls but this would be quickly adjusted. I managed a few lowish 3m boosts and a couple of higher ones (5m maybe) and a few backrolls. The souls responce speed was probably not helped by the bar which at 50cm I thought was a little small. The bar was ok but not my favourite.
What has been said about Soul v Hyperlink is that they are similar kites with the Soul leaning more towards traditional ram kite qualities and the Hyperlink leaning towards more LEI style qualities. This seems pretty spot on to me and both kites are great and I would be happy with either of the two.