What's ergonomic for me (long fingers, large-ish hands) will be different from the next guy, of course. I tried 3 grips on the X-T1 before it worked comfortably for me. Lots of nits on that camera, like the inability to do back-button focus without cramping my thumb or the lack of tactility to many of the controls.
The X-T1's a fine camera for me in many ways, but ergonomic? No. My most ergonomic cameras are Canons. The 1-series is superb, the 5- and 6-series very good. Leica M bodies? I have to add grips and, for the digital models, a thumb rest. Generally speaking, the smaller the camera and the more controls, the less ergonomic it'll be.