While "performance" is undoubtedly top of the interest list for the HN crowd and many others, there's more to talk about. The size of a sensor defines the fund

While "performance" is undoubtedly top of the interest list for the HN crowd and many others, there's more to talk about. The size of a sensor defines the fundamental "look" of the format, which is simplistically stated as the DoF for a given focal length, and not just the general field of view. That "look" is also made up of the lens characteristics, and in general, those lenses most popular or available for said format, i.e. 35/50mm for FF/35mm, 75/80mm for 645 or 6x6. Creative decision making takes place outside of the moment of shooting, too, and having those options is a key reason my kit cupboard hosts everything from half-frame to 6x6, as well as mirrorless and FF digital cameras. In the past, fewer options have meant that amateurs and professionals alike operating on the same or similar platforms. In modern times, few amateurs that I know run digital medium format cameras. Actually, none. While it's marvellous that my iPhone's performance is so good, but once past the pixel pushing, the tiny sensor is mercilessly exposed by my geriatric Leica M9 despite its "rubbish" sensor, because the look of FF combined with Zeiss glass is just fantastic. And it's always ready to do its job. I think the best camera is the one that gets out of your way. iPhones are ponderous to get ready for shooting if locked, and when I need to take a picture, I need to take that picture. (edit: apologies for any incoherence, just gotten home after 7.5 hour drive)