Surely this isn't the main issue with the M8, the really big M8 problem is IR spillage into the shot when used in artificial light.
The key word in your statement above is "artificial light" -- and more specifically, artificial light high in IR or "hot" light.
I spent the past two days pushing this camera very hard to try and make it puke.
The simple fact is I can only generate the purple-toned blacks if shooting under "hot" tungsten, halogen or strobe (xeon) lighting. It was *not* an issue under my CCT (cold cathode tube) continuous lighting nor under several types of indoor fluorescents I shot it under.
Moreover, I added an absorption-style IR cut filter (daylight version) and it fixed 99% of the IR bleed probelm -- to the point where I had to make some extreme image adjustments to find any IR hot spots in the shot. I did not test it, but I am convinced had I used the stronger tungsten IR cut filter it would have totally eliminated the problem.
Since *my* use for the camera is almost exclusively outdoor, I tried everything to make it fail under sunlight -- and couldn't. I shot directly into the sun at ISO 1250, sun through trees, sun refelcting of of multiple colors of automobile paint, chrome, aluminum, house paints, fabrics, you name it and I shot it. And I had absolutely zero issues with IR bleed.
My take on it is that if somebody is going to be using the M8 in a studio situation under direct hot lighting, then they probably have cause for concern. If they are primarily outdoor shooters, it is essentially a non-issue.
If they happen to shoot indoors under avaialable lightling it may be an issue especially if they are concerned about accurate color rendering -- however, even with film this was an issue and one needed to filter for it if they expected accurate colors. And street and PJ photographers rarely bothered filtering their film for color-correct mixed lighting.
Personally, I think for most applications the M is going to be used for, this will be a small issue -- and if it a big one on occasion, you have the filter fix available.
My .02 only,