Has anyone noticed a checkerboard type noise in C1.
Yep, it's old news for some of us.
I've railed against this aspect of Cap One's demosaicing at length
on the Phase One forum, and I've commented on it here too: http://www.luminous-landscape.com/forum/index.php?topic=66110.msg526125#msg526125
The article I refer to in that post is here: http://www.captureintegration.com/2010/12/03/noise-reduction-in-c1-6/
- click on the "Before and after Single Pixel Noise Reduction" image and you'll see a "perfect" (albeit exaggerated) example of the artifact.
This is why - although I still think of Capture One as my "default" Raw converter - I don't use it on high(er) ISO files, or files that are likely to need a lot of adjustment "heavy lifting"; and I don't capture sharpen on conversion either, because doing so really
exaggerates the chequerboarding.