The singing was good - Tosca's voice was particularly nice. Sadly and unexpectedly though, there were almost no moments of magic in it. What I love most about opera are the vocal and musical moments which are transcendantly gorgeous, spellbindingly good. Peter Grimes had a large handful of them. Tosca didn't, sadly, which is part of what failed to keep me from making the following comparison in my head, off and on, over the course of the opera... The costumes were much more fun to look at than Peter Grimes - but what do you expect, when Tosca is set among Roman nobility, whereas Peter Grimes is about early 19th century English fisherfolk on their work days?
No Man's Land is a movie about the Bosnian-Serbian War. It's a good movie. It's a strong movie. I'm very glad I've seen it.
Cavaradossi clearly is the equivalent of Cera, the man on the mine. His fate is sealed for him even more by other characters than his own action, and his death becomes nearly inevitable. The other characters spend much of the time comforting him, that he won't actually die.
Tosca is Ciki, Cera's fellow countryman. She's a flawed character, full of vices, but they're small when compared to Scarpia/the bad guy. She uses murder for revenge and to try to save herself. She spends lots of time comforting her partner, that really, he'll make it through all of this.
Scarpia has to be Nino's commander, the one whose role in the movie is short but violent and long-lasting. I can't remember the character's name, if he had one. But he didn't care about his minion, and he planted the mine underneath Cera. He's a tormenter of his fellow-man, with little or no conscience, and puts everyone else into such a lousy situation.
I'm less certain about the other characters. Nino doesn't really have a direct equivalent - perhaps Angelotti, if his role had been fleshed out a bit more in the opera. He, like Tosca/Ciki, is dependent, but a rival to Angelotti/Nino, especially when Tosca thinks that Angelotti is a woman sleeping with her beloved.
Hmm... maybe General Soft as the sacristan? Well-meaning, but with lousy consequences? Really, it's just the other characters about which I can develop prolonged comparisons.
Another similarity: nearly all the major characters in both die, are killed, or might as well be dead by the end.