I have printed 18x12 from a cropped image made with an X-E1. I do not see any shortcoming with respect to resolution. I think you will just fine with the X-T2. In fact, now that I'm using an X-PRO2 (same sensor as X-T2) it's not the additional pixels that continue to surprise, it's the dynamic range that is the biggest deal. Situations that previously called for HDR now only need LR's Dhadow and Highlight sliders.