Dirk,
Let me rephrase. It's one thing to design a product (lens in our case). It's totally different story when it comes to making the product. I know that Leica used designs of Zeiss, Minolta and Schneider in the past (I think there were even couple lenses that were actually made by Schneider for Leica). But using someone's design and producing your own version of a product is not the same thing as asking Kyocera to produce Summilux that will be sold as Leica. Almost any camera manufacturer produced or still produces their own version of Zeiss Planar, probably the most widely copied lens design in the world.
Also, from your post I got impression that you're saying that Kyocera is still producing something for Leica. I don't know if that's still the case, hence the question I posted.
AFAIK Kyocera did indeed produce some zoom lenses for Leica-R, but these were Sigma-designed lenses, which were then redesigned by Leica. I seriously doubt that Kyocera had any involvement with Leica-M line or that Kyocera designed AND produced lens for any Leica. Leica went to Kyocera for production of the lenses that they didn't consider top-performers (that's my understanding of their past partnership).
Leica's sales are mostly in Leica-M line and when paying over $2,000 for each lens, people certainly want the best, which is something Kyocera isn't known for.
As far as mobile phone industry goes - many makers may certainly use some parts produced by Kyocera at their discretion. But these are usually not vital parts. Kyocera's own market share in mobile phones in US will most likely disappear completely very soon - I don't know a single person that liked Kyocera phone they bought. Almost everyone I knew that had Kyocera phone switched over to Motorola, Nokia, LG, Samsung or even Ericsson within a year. To put it simply - Kyocera phones suck. This technically applies to many of their other products as well, and the problem is often not even the product itself - it's the service.
As far as Leica's former CEO goes - sure industry is small and it's not a big surprise that one German company hires a person to CEO's position that used to work for direct competitor, which is also based in Germany
Perhaps they wanted to get some inside scoop on their competitor. Perhaps it was something else. It doesn't really matter that much considering he spent only 4 months in the office.
This may also explain why he spent only 4 months at the job - perhaps clash of cultures. He wanted things done his way (the Zeiss way), the rest of Leica company wanted things done their way. Or maybe he wanted to tear everything apart and drive Leica to the ground
We will probably never know.
Anyhow, my point was that if Kyocera really partnered with Leica at the same time it was partnering with Zeiss, it's very odd that Zeiss and Leica couldn't form direct partnership.
Right now Leica has excellent partner in Matsushita. Panasonic digital cameras with Leica-designed (and probably Panasonic-produced) lenses are becoming more and more popular these days (I own one myself, it's good for what it does). And digital camera production is probably the only area where Leica would need a partner like Kyocera, but since they already deal with Matsushita, I see no point for them in dealing with Kyocera.
Going back to original discussion - I really hope that production or design of any Contax products will NOT be handled by Kyocera in future. I think Kyocera is unreliable as a partner and with their terrible service it's in our best interest that they play no role in future of the Contax brand.