Not quite. It was the M8, the 8.2 and then the M9. The M8 and M8.2 both have thin IR cut filters on their sensors so require an IR filter on the lens unless you can live with bilious greens and blacks. IIRC the M9 has a greater IR cut filter but some say it still needs an IR filter. I do not use one.
I kept my M8 after buying the M9 and M Monochrom. The CCD in the M8 has higher saturation count by ~50%. The M9 sensor required more "thinning" for the off-angle light of the full-frame format. The M8 also has 1/8000th shutter speed. I have a lot of "Hot Mirror" filters from the first-gen digital cameras. The M8.2 has the same shutter as the M9.
Regular sensitivity wise they are same. I got M8 for curiosity after getting M-E 220 and was shooting both for some time. The only test I did was for ISO sensitivity. The rest was not nose picking, but real life photography. I noticed dynamic range (real one, not ISO pushing) was slightly narrower on M8, but it still produced fine pictures. Also, I noticed what M8 files were feeling slightly sharper after downsize.
But as it is only 10m along the road from home I didn't get too cold!
I just tested this "locks up if two shots are taken with third party batteries" as that is what I have, cheap guy that I am. On my M8.2 with a freshly fully charged battery in each case - two were tested - the M8.2 ripped off ten shots before it stopped. In a similar test on the M9 with a not fully charged battery I got seven shots. Both cases the selector switch was set to "C" for continuous shooting. So while some third party batteries may not allow real continuous shooting the two I tested do. Conclusion? Third part batteries for the M8/8.2 and M9 are spotty.
