Ordinarily I would have thought that this crash was unsurvivable, looking at the pictures. I am inclined to agree with an earlier post that this craft was "crash landed" rather than "crashed", that is it was under control. Another reason for the high survival rate is the incredible strength of these old birds. I sure would not have liked to see a plastic fantastic composite aircraft after an arrival like this.
The pax, to the best of my knowledge were aviation people or the family of aviation people so much more likely to stay calm under the circumstances.