FOR THE 40 YEARS THAT I’VE BEEN reviewing camera, it’s only happened on a few occasions. What am I talking about? Well, the magic that happens when everything comes together in a remarkable way to create a camera that is truly special. It’s not just about great design and the clever application of new technologies; there’s a secret ingredient that somehow turns the basic recipe into a masterpiece. What is this secret ingredient? If I knew, I’d probably be the highly paid head of a camera company’s product planning division, but I do recognise it when I encounter it. Thinking back, the real standouts aren’t hard to recall – among them are the Canon T90, Nikon F5, Hasselblad XPan, Nikon D3, Leica Q and, more recently, the Canon EOS-1D X…