I moved from full frame DSLR (Canon 5D) to Fuji cropped frame, and never looked back. There is nothing inherently 'better' about a 24mm x 36mm sensor - though most of them are stunningly good, whereas smaller sensors range from stunningly good down to, not-very. I'd probably be reluctant to go as far as Micro 4:3 though I have seen some stunning images from Olympus and Panasonic cameras so my reasoning is far from rational. The Sony FF cameras are appealing, until I start using them, the ergonomics doesn't suit me. The Nikon Z is remarkably big. I'm sticking with Fuji for now as their prime lenses are absolutely stunning and the results I get are plenty good enough for huge exhibition prints when I need them. Ultimately, sensor size isn't the issue. Quality of sensor and especially lens is, and after a while, handling has just got to be right.