I've just watched a frame-by-frame of the HD digital version on iTunes, and it's still unclear, but it appears as though Rey hits Kylo's blade very close to the hilt, knocking it out of his hand and deactivating it, but not destroying it.
If you have the iTunes version the critical sequence is between 1:57:33 and 1:57:37. Kylo Ren's lightsaber is at an angle, with the tip being pressed down into the snow. We see Rey's saber enter frame at 1:57:33 (frame 1), clearly in front of the hilt of Kylo Ren's saber which is nearer to his hand. There's a clear distance of perhaps a foot between the hilt itself and the point of impact:
At the moment of impact (1:57:33 frame 3) we can also clearly see Kylo Ren's hand on the hilt of his saber, BEHIND the point of impact. There is a brief white flash as the sabers connect, suggesting that it's the blades that are impacting.
A moment later we see the saber deactivating, and try as I might I can't see if there are sparks or any other sort of indicator that the saber is damaged through the particle effects. Also, when Kylo Ren and Rey are seperated, we can see Kylo Ren's saber in the snow next to him - it's not 100% clear that the hilt is intact but there doesn't appear to be any physical damage to the portion that's visible above the snow:
To me this suggests that in film canon it's likely that Kylo Ren's saber is still intact.
(Stills were taken from the iTunes HD version of Star Wars Episode VII: The Force Awakens, which is ™ and © Lucasfilm Ltd)