Originally posted by haoto I don't think Pentax has any advantage at all in the lens front if they were to go m43. Imagine the DA40 as a 80mm equivalent, or the DA21 as a normal.
Also, I'm not seeing people buying Pentax bodies if they can use the same lenses on the technically more advanced Panasonics. Hoya can't be that stupid.
I agree here - Pentax's existing lens lineup with an adapter would be little more than stopgap until Pentax can release new lenses optimized for M43. And then they would be supporting M43, APS-C, and MF, and potential FF in the future. That's a lot of lens lines for a small company to support.
One other option not mentioned here is working with other manufacturers not yet in the game to create an EVIL format based on APS-C. It's ashamed that Samsung went their own way, as it appears Sony is on the verge of doing. Who else is out there and a potential partner? Ricoh? Casio? Fuji? Kodak?
The problem with an EVIL format based on APS-C, however, is that the lenses will still be sized for APS-C and thus larger than equivalent M43 lenses, so any size savings from getting rid of the mirror won't mean much for someone wanting a compact travel system with a 5x or 10x zoom. Compare the size of a K-x plus a 17-70 vs a Panasonic GH1 with the kit 14-140. The Panasonic comes out longer, smaller, if a tad slower.
So which way forward? Each path has benefits and compromises so it is difficult to choose. I for one hope for an EVIL based off of the K-x with a fully functional adapter (AF, exposure, SDM, etc...) for existing K lenses plus mini-K versions of the 16-50/2.8 and 50-135/2.8 to start. Maybe reduce the size of the lenses by making them F3.2 or even F4 at the wide end and bank on the high ISO performance to pull through in low light.