"I read somewhere that sigma provided all the profiles for their lenses and looking at the long long Canon and Nikon lists, I can't imagine Adobe went and bought/rented a warehouse of premium lenses purely to profile them."
True by all account! Canon and Nikon are not doing what is the best interest to their own customers (Ok, this is my own statement ). A number of other lens manufacturers have indeed followed SIGMA's example and provided Adobe with lens profiles. The list is growing. The user community has also help created close to 1000 lens profiles. Thank you all!