Your settings were wrong and that's why images are not good. Your primary problem is that you are shooting at way too high ISO. With X-T1 and jpegs out of camera (no raw processing) I don't go above ISO3200 because the noise reduction is too strong and it reduces details. Also, set NR to -2 and you will get a bit more noise but also more details, image will appear sharper. ISO 25000 is a disaster in X-T1, you should never use it. As others said, you should learn more about exposure triangle (and I don't want to be patronising, just helpful). Until you master it, you will have problems because you will select inappropriate settings with camera and you will have problems because of that with image quality. Not even one of your shot needs speed more than 1/250 s (even with your people's shot, that's more than enough to prevent their motion blur, because they are almost stationary).