>>2838800Nice idea, I've thought about it before.
But it would cost a lot more to make an oversize sensor that would cover these esoteric formats - not just because the chip yield from wafers would be even lower and therefore cost a premium, but that demand would very likely be lower thus demanding even more of a premium.
6*6 Medium format is 3136mm sq, so still 3 times more area. So not really MF at all.
Maybe Sony will bring out some kind of mirrorless 645 MF camera soon-ish. If so, then happy times - that kind of sensor is already in production.