X-T2 132.5 X 91.8 X 49.2 mm, 457g weight
X-H1 139.8 X 97.3 X 85.5 mm, 673g weight
Statement of the obvious; more inside -> bigger and heavier.
I like the smaller and lighter, and as I am not into video ( serial input to brain rather than parallel input of a still), I will stick with my X-T2. No IBIS does not worry me, wind up the ISO or dig out the tripod. Love the prime lenses. Others will like the new camera, I'm sure.
Jonathan