It depends on the context that you are writing/ speaking about and what you message you intend to convey. "among them this opera is remarkable" "Of all the other operas this is phenomenal/ fabulous/ outstanding...etc."

Thank you for your comment, Jan.

No. I cannot find the right words

'Among' is used to denote one out of several or many. 'Opera' is singular. You can say, "This opera is remarkable."