One small step down from full-frame IQ, one giant leap down in price & size!

I got to put this new lens through its paces on a Death Valley trip and had a blast.

With the short focal length and stabilization, it's very easy and forgiving to use handheld (though I find a tripod helps a lot for composing with the rear LCD on my original EOS M body). Autofocus usually nails it, even for pixel peeping lens tests. (The only "miss" I experienced was with some thin flowers in the foreground - really my own bad...)

I'm very pleased with the performance. Corners are good from wide open, but I found f/8 to be the best general landscape setting. (Sharper with less vignetting.) Flare resistance and sun-in-frame behavior is much better than the kit zooms, 15-85 and legacy wide angle lenses I've tried. In fact, I prefer the results I get with this zoom over an equivalent legacy prime on my full-frame A7. (That is a significant first for me.)

Distortion was less than expected, and easy to correct in Lightroom. The automatic profile doesn't quite straighten a flat horizon but that's an extra 10 seconds with the manual slider and usually not really necessary.

Sun stars aren't the best but they can be obtained. (Might look elsewhere if that's a major overriding priority.)

The collapsable aspect is a mixed blessing. Is it worth having to expand & collapse the lens each time you deploy, in exchange for being able to stow the whole package in a smaller bag? In my opinion, yes.

Overall, the size and weight points are major plusses. As is of course the price. Could the 16-35 for my A7 provide more pixel peeping detail and a few nicer character nuances? Probably. Would I notice the detail in a 13x17" print? Probably not. (Better sunstars, most definitely.)

Would that all be worth the extra bulk & weight, an extra $950 and not least of all for me the peril of changing lenses in a dust storm? Perhaps in the future. For me this lens was a great way to ease in to the wonderful world of ultra-wide zooms. If I find myself using it constantly, I may eventually make the bigger investment for the bigger system. All the while, I'll probably keep taking this little package places I wouldn't want to take the full-frame - and enjoying results that are fully print-worthy.

The biggest glaring weakness for me would be night shooting. I've been able to focus on stars with other stopless electronic focus lenses but not with this one (at least with the original M body with no EVF).

Not the strongest at 22mm but good enough! (Beats changing lenses in a dust storm!)

Devil's Golf Course. Distortion correction tweaked manually in Lightroom.

Devil's Corn Field

Pretty good contrast for sun in frame

Cliche asphalt test

We don't need no stinking selfie stick!

The best sun star so far with this lens. (Erased a couple of ghost spots in Photoshop.)

Mod's, any chance of moving this to the EOS-M forum? 

Newest cameras,.especially those 24Mpx, coupled with newer lenses, clearly challenge two generations old FF setups, especially at base ISO speed. I would definitely pick M3/M4 with this 11-22mm lens instead of EOS 5D II and old 16-35mm L. Golden ages of cheap good APSC systems are still ahead of us...