The combination of bright sun and haze must have made this a real challenge to photograph. The bright sun has created some hotspots on the "sail" and the mist haze has created some lack of clarity. Also, it would have been better, I think, if the main subject hadn't been quite so centred.
Did he jump off a cliff and are you shooting this from the cliff? Beautiful sight, I'd love to do that some day! I wish you could have zoomed in quite a bit more, and filled the frame with the person and and hang glider.... but if you didn't have access to a zoom thats understandable. I just think as a sports shot this would have been more applicable if you could see the exuberance on the persons face. Since you couldn't I still would have tried maybe to crop differently as it is the hangglider just sits in the middle of the frame... not very attractively done composition wise.