Nevertheless, it's not been seen in the wild yet (and we still don't know when the phones Nokia showed will ship) and hasn't been reviewed by the press beyond quick run-thoughs in 'controlled conditions', so to say it's 'by all accounts a very good phone' is simply not sustainable. It may well be a very good phone. But nobody can actually say that yet. And, frankly nobody actually has said that yet.
One prediction I will make though, the iPhone 5 will be available to buy before Nokia's new phones will. So the idea that Nokia's presentation will tempt people away from Apple will probably fail. Unless you actually think 'no, don't buy that shiny new phone, wait and buy our new phone instead, even though we haven't told anyone when it will be out or how much it will cost' is actually going to work.