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In my comparisons of the DP2M and DP2Q I talked with you about on luminous landscape, I saw the same issue in my tests of trees set against sky that you are seeing here with the DP1Q. And is indeed a "bayer" type of problem.
It is quite unfortunate that this new layout introduces the potential for this type of artifacting.
While Sigma DPP greatly improved red color resolution with SPP6.0.6 as well as shadow detail rendering, Sigma's software is still a work in progress.
I have also noticed that Quattro files in SPP are prone to having some other interpolation type of artifacts, especially in some very fine repeating details, such as the chimney grill work example I posted on luminous landscape thread.
One further issue I found bad about SPP renderings thus far are in night photographs where a very rough stair step pattern occurs over highlight areas that is simply not present in Merrill files. Merrill files actually have a very pleasing roll off of highlights. I have even tried all the setting related highlight retention and recovery in SPP for the Quattro files and they fail to match excellent default Merrill rendering.
The net result of all this is that short of Sigma addressing these issues it mitigates any feeling towards upgrading to this new imaging layout. In fact, I have actually gone back and purchased a refurbished DP1s because it retains the good aspects of the x3 layout while also having more color in the shadows.