Yeah, that's the one. (Unless you've just gotta have it in f/2.8). There seem to be a variety of Canon lenses that start at 16 or 17mm, for some reason, and I get them confused a lot! (Most of them are discontinued, but apparently there's still a 17-40mm f/4L out there, that I *infer* is older and not as high a quality optically.)
I have the 17-40/4L. I shot with for a few years, but I found it was particularly soft wide open. Paired it with a 50/1.8 and 85/1.8.
Now, I primarily use a 10-22/EF-S and a 24-105/4L and am pretty happy with them. Along the line I bought the 16-35/2.8L-I (on sale. . .as it was going out of production) and have been quite content. ESPECIALLY when I shoot it at F4. I use this lens primarily for low light situations with ISO 3200+ shots.
If I was building a kit today, I would definitely get a 16-35/4L for a FF camera. On APS-C; I really like the wide end of the 10-22; which pairs nice with the Canon 24-xx options.
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So I have a X0D with a flippy screen, and a G7x-II with a simple flip up screen. Honestly. . . I am happy with both. If I have my "big" camera out and about, I am probably taking some care with my shots. . . . and quite often I use the screen at an odd angle so I can setup a shot without being a contortionist. This mode is very useful for selphs; flower shots; and for eclipses of various sorts. It's a nice option. And a strong selling point in my mind.
The G7X is more of the camera used for casual shooting; the simple flip screen suffices. NOTE: The flip screen is critical for selphie mode. Would not buy a camera without that capability at this point.