How long is a piece of string?
I've had this type of question dozens of times in my working life. It still astounds me.
Just think whether the operating cost would be the same if flown by Ryanair or Air France, and you will start to understand. And do you mean just direct costs or including all overheads down to the CEO's mistress?
If you will be the operator, you will know how much you're going to pay for crews, insurance, maintenance, lease, finance etc. No need to ask elsewhere.
Whichever way, the cost will be closely linked to the operator's local environment, and it's not an easy sum to do. Get your calculator out!
B772, at least you understand. For some folks it's always easier to ask someone else. Avoids thinking too much!