So... is it sharp? In the corners? At 11mm? At optimal aperture?
I'd love to know, as I just got my M in the mail today, and a compact UWA for taking landscapes while backpacking would be pretty sweet.
Mini-rant on the M itself: after taking the time to read the right parts of the manual, wow, this thing is actually pretty fun. Really well built, size so tiny, IQ great for such a tiny camera, and it comes with a nice strap, too. The 22mm is fairly sharp at f/2, decent bokeh. AF isn't fast by any means (then again, my other camera is a 5DIII), but once I decoupled AF from the shutter half press (it moves to the "*" button on the back), disabled pre-focus, and enabled the AF+MF mode, it feels right for my walkabout shooting style (shutter release is also quite a bit faster this way). Would actually make a great camera for street shooting in this setup, assuming you don't mind tweaking focus manually as you go. For the purposes I intend to use it, I like the M better that the RX100 - mostly because better ISO performance and IQ of the lens the 22mm is way better in the corners than my RX100 was at wide angle.