Originally posted by ogl IQ of m4/3 is far away from K-5, for example. And from K-r/K-x too.
I may be wrong, but to me it seems like that has as much to do with the fact that all m4/3's sensors come from Panasonic where as the K-r/K-5 both use excellent Sony sensors. The Canon 60D pixel density is 5.4 MP/cm² where as Olympus 12mp m4/3 sensor is 5.1 MP/cm², yet the 60D produces better results at high ISO. I think the problem is just in the Panasonic sensors; not the 4/3's sensor size. I'm really hoping Olympus can find another vendor if Panasonic can't do better.
That said, I'd prefer Pentax use APS-C (even APS-H or full frame). I can get by with 4/3's, but anything smaller is unacceptable. It's just too hard to get shallow DOF at wide angles if you go any smaller. Also, if they do indeed decide to use the 4/3's size then I really hope they just join m4/3's and use that mount. As much as I like Pentax the only way I'm going to choose them over m4/3's is if they use APS-C or larger sensor. Why would a buy a 4/3-size camera from Pentax when I can buy into a much larger system with Olympus/Panasonic?