Off the top of my head, I couldn't tell you who makes the lenses for Sony's digicams,
Zeiss. At least on the top models.
but I wouldn't immediately consider a Sony over a Canon because of those two, I know which one specialises in photographic items. Same for a Pentax, or a Nikon, or an Olympus.
The nice thing with digital is that it's *very* easy to compare image quality between different models. From what I've seen until now, Canon and Sony (Zeiss) are doing better, with lower chromatic aberrations and so on. And both are good at electronics too.
cheers, caveman