Echo YuropFlyer comments.

However he overlooks one key fact which I feel is important! Emirates Y on 777 is 3-4-3 abreast. I don't mean to start that old argument again, but you should be aware of this, and make your own judgement.

I used to enjoy flying Y on the A330. I did it once on the 777, in 2006, and vowed never again. I found the narrowness uncomfortable in the extreme. If you're a narrower person than me, or travelling with a friend next to you, then maybe you can stand it.