We liked the original X-T100 for its clean lines, low cost and user-friendly features, but the X-T200 ups the stakes with a big, vari-angle touchscreen, vastly better 4K video features and improved autofocus.
Big 3.5-inch vari-angle touchscreen; Good 4K video features; Neat design; and now even lighter
Simplified external controls; Regular CMOS not X-Trans sensor; Quite expensive so far