Ok, I'll play.

As with Brant, these are based on the saved RAW images (tabulated with Aperture Inspector).

For cameras in 2017:
Canon EOS-1D X 76%
Canon EOS M2 16%
Canon EOS M6 8%
My usage 'rate' for the M series was esentially constant in 2017, since I had the M2 for the first 2/3 of the year and got the M6 (as the M18-150 kit) at the end of August. That rate was a little lower than for 2016, which was ~70% 1D X and ~30% M2.

As for lenses...

On the 1D X:
Lens 2017 2016
Canon EF 11-24mm f/4L 25% 4%
Canon EF 16-35 f/4L IS 2% NA
Canon TS-E 17mm f/4L
 5% 3%
Canon EF 24-70mm f/2.8L II 30% 35%
Canon EF 40mm f/2.8 1% 0%
Canon MP-E 65mm f/2.8 1-5x Macro 1% 0%
Canon EF 70-200mm f/2.8L IS II 17% 45%
Canon EF 70-300mm f/4-5.6L IS 10% 7%
Canon EF 85mm f/1.4L IS 3% NA
Canon EF 100mm f/2.8L Macro IS 1% 3%
Canon EF 600mm f/4L IS II 5% 3%
Not nearly as consistent y/y as Brant's usage. My usage of the 11-24L was 'artifically' high in 2017 – we bought a new house in May, then listed and sold our previous house. I did the shots for the listing myself, almost entirely with the 11-24L, and almost all the shots were HDR (brackets of 5 exposures). Omitting the real estate shots from the usage, the 11-24L drops to ~8% (which is consistent with 2016, since I got the lens half way through that year).

Lenses not used in 2016-2017 include the Rokinon 14mm f/2.8, and the Canon TS-E 24mm f/3.5L II. As with Brant, I tend to sell lenses that I don't use at least occasionally (thus, the 35/1.4L and 135/2L are gone). I'm keeping the Roki 14/2.8 for the same reason as Brant – it's a go-to for astro photography (the extra stop buys more star trail-free exposure time than the 3mm of the wider 11-24 f/4). Likewise, I'm keeping the TS-E 24L – I continue to shoot architecture when traveling, but I've left the longer TS-E at home in favor of the 11-24L since getting that in mid-2016. Because of the ease of filtering the TS-E 24, I take that when I know I'll be shooting in the daytime (although I have the salad plate Wonderpana 145mm for the TS-E 17, it's rather cumbersome).


On the M series:
Lens 2017 2016
Canon EF-M 11-22mm f/4-5.6 IS 48% 71%
Canon EF-M 18-55mm f/3.5-5.6 IS 0% 1%
Canon EF-M 18-150mm f/3.5-6.3 IS
 17% NA
Canon EF-M 22mm f/2 31% 13%
Canon EF-M 28mm f/3.5 Macro IS 1% 1%
Canon EF-M 55-200mm f/4.5-6.3 IS 3% 14%
My M-series usage definitely shifted after getting the M6. With the M2, it was mainly a backup camera for travel and only occasionally did I take it on family outings. The more expansive controls and speedier focusing of the M6 have resulted in me taking it along instead of the 1D X on family outings, and a concomitant shift from mainly the M11-22 to more usage of the M22/2 and M18-150. After getting the M18-150, I haven't used the M18-55 or M55-250 at all. However, I will be keeping them since I plan to hand down the M2 to my daughter (who turns 10 this month), probably with the 18-55/55-250 setup, but perhaps with the 18-150 and I'd return to the 2-lens setup.

Thanks for posting, Brant – it's a helpful exercise to review usage year to year.