[sholtzma]

I can't see much reason why there would be any difference between k-5 vs K-5 IIs noise performance, at the sensor level, in RAW or in the JPEG output.

I shot a low-light event with both the K-5 (mine) and the K-5iis (rented). The high ISO shots of the iis were about one stop better for noise than my K-5. Rather different post-processing needed for each when it came to noise. I thought briefly about sending the K-5 back to the rental store in hopes that they wouldn't notice....

[rawr]

The high ISO shots of the iis were about one stop better for noise than my K-5.

Interesting. First I've heard of that. 1 stop is a big difference, but it doesn't show up on stuff like the DxOMark tests.