For a while this year my two main cans were Focal Clears and the P9s.
The P9s have wider, thicker and in my opinion, certainly better delivery of vocals. The clear's were a bit thin and lacking emotion (relatively) in this regard; I wasn't that impressed with the 'feeling' in the vocals on them, which is a shame as they handle other things very well.
The clarity is incredible, as the name suggests. They really come into their own for me on instrumental tracks - I just can't get over their poor render of vocals (especially for the price). I like to feel the music, if that makes sense, and I found that difficult on the clear.
The P9s in contrast are a funner, warmer sound, but in my opinion also just plain better. They capture musicality, the art of the music, at risk of sounding pretentious - while the clears are just technically brilliant. The P9s will make you want to dance, while the clears will make you exclaim 'oh, wasnt that a nice instrumental?'. It's a very different vibe, but I think you can say objectively the P9s deal with vocals significantly better than the Clear's. The width and depth of the vocals is just so much ghreater.
In the end I was listening to my P9s so much more that I just sold the Clear's on ebay, and haven't missed them once.