I found a web site with Kodak's public relations blurb on the KAF-10500 sensor used in the M8. What's interesting is that it includes a price. $650 in single-unit quanities. Now, such prices are pretty meaningless, since these are always sold in much larger quantities. From my experience in the electronics industry, I'd estimate that Leica is paying $350 to $450 each for them.
Here's the link:
This certainly makes the sensor a sizeable proportion of the total parts cost of the product. In the networking field, parts cost is usually only 10 to 20% of the total retail sales price. Cameras have historically lower retail margins, so I don't know the rules for that industry. (I've seen former camera salespeople say that their store made more profit on the UV filter than the whole camera/lens.)
Another interesting price point. I found a vendor selling cameras for astrophotography (telescopes). They offer all the big Kodak sensors as an option in their units. The one with the KAF-10010 (the one in the DMR) was a bit over $10,000! Now, they have lower sales volume than Leica, but it shows that Leica's not exactly trying to gouge folks with their high-end digital products.
Kodak is not a low-cost CCD sensor vendor. They're selling to high-quality brands, because they make darned good sensors. Their KAF-22000 and KAF-39000 are the 22mp and 39mp sensors used in the latest Hasselblad backs. Others are used in digital X-ray machines.
Kodak does have a line of cheap CMOS sensors for cellphones, etc.
If I remember right, the CCD sensors are from a company Kodak bought, where the CMOS ones were from their own team. But I may have that tangled.