I haven't read the novel of The Leopard, but I watched the film a while ago, and remember enjoying it for the same sort of evocative richness as you describe here. Plus it has Claudia Cardinale in it (see icon) - can't go wrong! I'm sure it won't capture everything the novel does, as films just can't in the time they have, but if you've enjoyed the novel I'm pretty sure you'll like the film.