wow, most of us had been labouring under the delusion that musicality can be measured in a 100% objectively verifiable way, so thanks for enlightening us.
It's not so bad here, and in the world of piano in general so far as I've seen... But coming from the world of rock guitarists, you'd be surprised at the delusions people can harbour.
I'm not too sure about the idea of actually
ranking musicality, but it sure is valuable to be able to give some reasons why you like something. Structural grasp is a bit trickier too, right now I tend to hear the structure in terms of flow and points of climax, if a pianist can display the points of intensity without diminishing the importance the the preparation for that climax or what comes next... Tough to talk about, I've got some learning to do

i vote for my teacher carl cranmer. maybe musicality comes out better when you sit closer to the piano. any one of the above pianists could mesmerize me - but proximity gives you a better idea of how it's actually accomplished. when someone takes the time to actually decide 'am i going to do this or that' they are way more musical than just doing whatever because they feel like it. i have learned that to come across in a big hall is MUCH different than a small room. that you have to express yourself more. i don't know if i'll ever be capable of doing this even half as well as he does - but seems that he always considers the size of the room and what he wants his audience to hear. it's planned and yet unplanned. you have to be almost a sort of audio/visual guy/gal for yourself. and, to know what your piano is capable of. seems that he does a lot more experimenting with sound and techniques than i've heard others do.
I agree with thinking through interpretations, that's how to develop musicality in the first place, some people seem to approach the idea of musicality as though it's some sort of innate skill that you either have or do not. What I really appreciate from my teacher is that he's able to suggest a better way to play something and then explain
why it sounds better. It's a lot easier to listen to someone when they can give reasons.
One cool piece of performance advice he gave me was the difference between how the pianist will hear the music and how the audience will hear it. The lid of a grand opens up to project the sound towards the audience, who often can hear the music better than the pianist playing it

. He showed me that the music stand can act as a wall between pianist and strings... So if you've got the music memorized, get that stand outta the way so you can better hear the music, therefore better control it and give a better performance.