It’s interesting to note Nikon are opting for a small sensor. I think it might be a brave move. Small sensors up till now mean poorer dynamic range & poor low light performance. Even although Nikon think they are appealing to a new market segment my hunch is that APS-C size sensors in Mirrorless camera’s will win out eventually. I think micro 2/3 sensors will struggle eventually also. At the end of the day we all want lighter & more compact DSLR’s, & even rank amateurs will take note of reviews on the net before buying.