And I thought the N6006 was the heaviest, loudest Nikon. To be honest, I would rather sell my car. No matter waht you do keep the Nikon. I don't know the F4 that well but I know that as hook on digital as I am I would rather wait for an 11mp Nikon that get anything else. I am so sold on Nikon that I will be with them forever. One thing you need to consider is that National Geographic may be using Leica's but if the bodies fail in anyway it is a tax write off. They can replace them with no more than a wave of the hand. An individual can't do that as easily. Keep the F4 and get a big dog. Magick Michael