It is in no way comparable to the ultra deep field. That's optical. This is sub-millimetre (the region between infra-red and microwave). You see entirely different things, and use 'em for entirely different purposes. It's like saying that a Formula 1 car isn't better than a mining truck -- it's a meaningless comparison.

Unless you're just saying that the images aren't as pretty as the Hubble Deep Field, in which case I agree. Things always look prettier in optical than in radio.

The article does mention that only 19 of the planned 66 are on-line yet. I think considering that, it really is a pretty stunning photo.