It's always interesting to get another opinion. I notices my differences based upon having cruised on the Diamond last Nov, the Grand in Jan, the Dawn in June, and the Island in Oct. We'll also be on the Ruby this coming Jan & Crown in Feb so I can compare some future experiences & will be sure to comment on them.
BTW - I just talked to my neighbor last even who was also in the Emerald during an Atlantic crossing earlier this year & questioned him on the seat width. Sure enough he also thought they were mighty tight. The one good thing is that they can't make them any smaller.