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I did see those comparisons and they are pretty much in line with what I've been seeing between my 35mm 1.4 on the XE-1 and the DP2m, other than a little closer in focal length.
The 35mm, as is the Zeiss it appears, are both really good sharp lens, which is reasonable to expect at the price points and moderate focal lengths.
They render good sharp detail as well, but areas where I can see some differences are the edges of the frame, as the Merrill is as sharp in the center as it is the edge, and also for more distant details. I guess it maybe just comes down to the sensor and different wavelengths of light perhaps, but the Merrills can this ability of just making everything in the entire frame sharp, if you give them enough DoF that is.
In the samples, just look at some fine detail in the background such as tree limbs. Even with less focal length advantage, the Sigma files are finely detailed where the Fuji kind of get a bit mushy.
Its not even an XTrans thing though as I can see the same thing with my Sony RX1 which has a real resolution edge with 24meg and a great lens, plus normal bayer array. Every bit as sharp if not sharper for closer subjects, but not more distant ones.
I've done some testing shooting some things like houses across a field and the differences are always surprising to me how much better the Sigma does, which is really why I keep it.
Of course in most situations one probably just cares about the main subject, but for those special landscape applications where you might want, say a foreground river, and then mountain peak in the background both to be really detailed, the Merrill is a great tool.
I'm again not sure exactly what gives it this advantage, if its perhaps different wavelengths is a theory I have, as I do find the cameras can cut through haze pretty well, and you do have full resolution of each channel, but whatever they do, it works quite well.