Yes, there are some excellent photos here. Photos that look like they were taking by an experienced photojournalist, using a photojournalist's skills, knowledge, instincts, access - and low end equipment. The camera in the iPhone is pretty good. Much, much better than most P&S compacts from only a couple of years ago and even many current compacts. There is an iPhone thread or two on here, and other dedicated iPhone pages elsewhere, that show it is capable of taking some great photos.
The thing is, though, that the old adage about a good photographer being able to make good images with poor equipment applies as much as it ever did. Dan Chung takes photos with a professional photographer's eye, instincts and reflexes. He can spot a photo in a way that I couldn't, regardless of whether I have a cheapy compact or a D4. That clearly shows in the better shots and that is what people give him money for.
What also shows is that many of these shots are closer to good shapshots than anything else. They display the skills of a pro and the limitations of an iPhone camera - no control over depth of field, limited compositional scope, badly blown highlights. The same shots taken by Dan Chung with an SLR would have been much better photos in all these respects and more.
So, for mine - I will keep using my SLR and trying to get better at using it. I love how it gives me the potential to control my images and the quality of the shots it can produce. I will keep using my phone camera because it is always with me, simple to use and its lack of control helps me focus on composition. I will keep using the other cameras I have gathered for a range of other reasons. What Dan Chung does with an iPhone won't change any of that.