Originally posted by sebberry Where was the bigger jump in IQ and high ISO performance? Was it from the K10D to the K20D or was it the K20D to the K-7?
Given that we can coax uncompromized(full size) ISO6400 images out of a K20D, I'd say that the biggest leap in high ISO performance came with the K20D. Though on the ergonomics and feature side of things, the K-7 clearly stands as the champion of Pentax updates.
Unfortunately... for the first of this generation of Pentax camera's, the addition of video and higher FPS brought along with it a small decline in noise performance and DR over that of the K20D. Which really doesn't come as an issue for a number of people as it all remains quite manageable up until ISO2000, after which, things escalate quite quickly in terms of efforts vs reward with image definition.
The K20D on the other hand, has received a number of breaks with regards to performance enhancements(see: Gordon B's tinge removal tool), that have allowed it to live past the initial operating ranges that came with it. Though the biggest advantage was the K20's unique ability to hold off longer than any other Pentax camera on ultra low frequency noise(aprox. 1.5 stops)
Which all works to place the K20D at the top of the Prosumer Pentax line-up, insofar as noise performance and DR goes. But all that is about to change... as we have very good reason to conclude that Pentax will announce a Kx class sensor in a prosumer body this year that will inevitably replace and retire the K20D's legendary status for good.
But that's neither here not there
As the winner for ISO/DR performance gains clearly goes to the Kx