This is a such a well-written article. It stood out to me when I read it a couple years ago and I enjoyed the revision.
However, I think it would resonate much more without the comparisons to the HD600. A better HD600 is a modded HD600/650, or an HD600 with a better amp. Focal presents pretty differently.
For me, my HD600s are solid, inoffensive all-arounders, and outstanding vocal specialists. So, to say that another headphone is better in every way except vocals, is a little like a restaurant being better in every way except the food.