I checked the full-sized versions of #6 and #16. There is no repeating patterns in the ceilings of #6 but repeating patterns can still be seen in the facade of ION Orchard in #16. Maybe there's something behind those narrowly spaced horizontal bars that form the facade of ION Orchard that's causing the optical illusion.
The shadows look darker in these images probably because of the broader dynamic range of Foveon images. There are actually a lot of details in the dark areas of these reduced size images that I posted. They can be seen in the 100% crops but could not be seen in the full images posted because they are all shrunk and squeezed together tightly eg #1 & 2, #7 & 8. Since I could actually see the details when I viewed these images at 100%, I did not try to carry out any shadow recovery and left them as they were.
I don't think any dealer would let you just try out the camera without buying as the DP2M does not really have a broad appeal to th usual photographers and the dealers therefore do not carry a lot of stock if any of this camera. Maybe you can try going to the local agent Audio & Photo Distributor (FE) Pte Ltd's showroom at
E-Centre@Redhill at Jalan Bukit Merah for some hands-on testing if you are interested in the camera.