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Assuming Samsung and Pentax have upgraded the old sensor with current tech then we might be able to expect noise levels 1.5 to 2 times as clean as the K20D.
You mean 1.5/2 stops better just by "tweaking" the sensor... unlikely IMO. 0.5 stop seems more reasonable...
I figure the D300 is a full stop better but has less pixels, and technology has added another stop improvement since then. So more than likely a native range of 100-6400iso with results at 6400 on par with 2000 on the k20d. Not bad I suppose.
this would roughly put the K7 on par with the D700... would be nice but I don't think it will happen.
Dynamic range also has some potential, given current tech we could see an extra stop to two stops gained here, unless pentax does something radical.
Again: one stop more DR is already a huge step from the same sensor and would put the K7D very close to FF.
I was expressing the extremes Pentax could reach. However, I do not thinking aiming for the D700 in terms of noise is that big of a stretch. I would venture to say that the D700 and 5DmkII share similar noise characteristics up to iso 6400 (I own one camera and use the other at the studio I help with). The 5DmkII has about 75% higher pixel density than the D700. So if we compare pixel densities and noise levels the 5DmkII is about equal to a 10mp APS-C camera. This means with the help of Samsung Pentax could do a couple things, 1. scale down the sensor to 12mp maybe, 2. continue advancing the tech beyond the quality present in Canon's designs, 3. improve NR algorithms, 4. improve AA filters, 5. come within .5 to 1 stop of FF and call it good.
I honestly think samsung has the potential here to be the best sensor manufacturer out there, Canon does a great job, but Samsung has more resources to tap when it comes to a lot of the design and manufacturing process. Forget about the Sony sensors, Nikon has taken them to there absolute limits, look at the D3x vs the A900, sony could barely utilize their own sensor to its fullest.
As for the Canon's choice on the video mode, I am sure a large part of that is them trying to keep the 5d on top. But remember the 5D also has a faster bus, and uses CF meaning larger card sizes and slightly faster cards, so unless Pentax goes SDXC on this new camera, they too will face the same limits.