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From what I have seen, the DP Merrill's seem to edge out the SD1 Merrill with regard to overall image quality, likely due to better optimization of lens with sensor. Not having to deal with some of the compromises in design that come with an interchangeable lens system - SLR or mirrorless - seems to have some pretty significant optical benefits. For instance, the lens can be placed much closer to the sensor and unusual optical designs can be used without worrying about other practical issues (think very large rear elements).
Anyway, I see these DP Merrills as specialized tools and really not in the mainstream of the typical compact camera (which, are most often than not, more general use cameras). As for the DP3, I think it would have been much more useful had it had a 60mm lens (90mm FF equivalent Macro). An equivalent 75mm lens, in my experience, is too short for most applications where I most often use a typical Macro lens - sort of in a no mans land of useability.