Thank you for your response. As I mentioned before, that was a very early image and I quickly realized that I needed a sturdier tripod, and I could not get away with just placing it on top of some dried grass, so my later images show less motion.
I went out this morning and shot my test scene - there is practically no motion detected in it (red circle around only motion):
Looking at various areas at 400%, it appears to me that RT is, in general, slightly worse than DCU in it’s default processing of Pixel Shift. But RT has a world of processing options; perhaps someone who masters those options could get a much better result.
All of these comparsions are DCU left, RT center, single image (i.e. no PS) right
I will check if my dropbox accout is still active and place the rawfile there.