One quick way to tell if it is a MCT or SCT is to look at the front glass plate upon where the secondary mirror is fixed (remember to take off any front filter first or you will be misled by the filter). A curved-in spherical front glass plate is indicative of a MCT, while a flat front glass plate suggests an SCT.
My Tokina 500/8 mirror lens seems to be an SCT, while my Russian MTO 1000/10 mirror lens is definitely a MCT.
The 'softness' of image is probably due to less contrast (the central obstruction has to do with it). If you shoot with highlights on background, you'll get donut-shaped bokehs. That's why I mentioned to you that the images obtained through these mirror lenses can never compare to refractor telescopes, especially the APO ones.