I thought the whole concept of Pixii employing the M mount was to attract M lens owners? Which I think is why you see so many people complaining about the crop sensor. I must say I'm kind of mystified myself that they've made the perfect modern digital rangefinder and handicapped it with the need to buy non Leica M mount lenses that are wide angle.
I believe the concept is to design a digital camera that has a existing lens mount for which there is a widely available range of lenses, not
just to appeal to those who already have an M and have a favorite range of lenses already. If the Pixii were being considered purely as an M replacement for owners with existing lenses, it would
have to be an FF format sensor to preserve the characteristics of those owners' lens kits. Moving to a smaller sensor allows a degree more compatibility, theoretically, and reduces the price. No new digital Leica M body with a FF sensor is available at anything less than about double the Pixii price. Even factoring in the need to buy ONE additional lens, like the CS21 or Zeiss 25mm, only brings the price up to 4/5 the price of the least expensive new digital Leica M body. And one additional lens is all you need if you already have your favorite Leica M lenses in 35mm and 50mm focal lengths and want the same range of FoVs that you have with an M 35/50/75mm lens kit.
And, in the end, if this is not acceptable to you, why complain about it? Why not just go spend the money for a new or used digital Leica M body?
I had film and digital Ms prior to buying the Leica CL. The CL became my primary camera for a couple of years. I added a shorter focal length or two for a wider field of view as a consequence, the CS21 being one of those. I wanted a rangefinder again, and chose to try the Pixii to see if it would suit my use with the lens kit I'd put together for my digital Ms and then the CL. It didn't suit what I wanted well enough, so I returned it and bought the M10-M ... which does. I don't feel there's anything wrong with the Pixii concept, just some issues in my use of it... having to do with haptics and control characteristics... and the APS-C sensor and resulting lens kit has nothing to do with that.
I just don't understand all the aggressive insistence that "Pixii must be a flawed concept!" because an APS-C sensor doesn't suit you or your present lens kit. If it's not the right camera for you, just buy something else. If you can't afford or don't want to afford a Leica M, well, there are plenty of other camera options around too. If the Color-Skopar 21mm f/3.5 lens doesn't suit you and the Pixii does, well, buy a Leica 21 or 24 mm lens instead. No one is trying to force you to buy a Pixii, or a digital Leica M, or a Voigtländer Color-Skopar 21mm: they are all just options for you to evaluate and use if they suit you.
The goal is to find a camera that is suitable for you, obtain it, and then go make photographs. Not argue about the intentions of a camera manufacturer...
G