Originally posted by reh321 What processor do they use? Is that processor available to Pentax?
And you already noted that it takes the extra "juice" from the optional grip.
The thing is, DSLRs are not limited to lower performance processors; so Pentax isn't either.
Now if we're talking about the PRIME IV specifically, yeah, that would need to be upgraded. But I have a hard time believing there's no faster option available, than this older Milbeaut.
Actually I'd say that Ricoh has no option but to upgrade the PRIME processor - not to be in line with the best, but to keep up. Who knows, maybe the new APS-C flagship takes so much time because of this.
L.E. The Accelerator Unit might need a boost as well - its introduction slightly affects the K-1 II's APS-C mode frame rate.