As a demonstration of EXOSIMS’s ability to compare different instrument designs for a single mission concept, we compare mission simulation results based on optical models of the predownselect SPC, HLC, and PIAA-CMC designs. As all of these represent preliminary designs that have since been significantly improved upon, and as our primary purpose here is to demonstrate the simulations’ utility, we will refer to the three coronagraphs simply as C1, C2, and C3 (in no particular order). Table 1 lists some of the parameters of the three coronagraphs, including their IWAs and OWAs, their minimum and mean contrasts, and maximum and mean throughputs. Each design has significantly different operating characteristics in its region of high contrast (or dark hole). C3 provides the best overall minimum contrast and IWA, but has a more modest mean contrast, whereas C2 has the most stable and lowest mean contrast over its entire dark hole, at the expense of a larger IWA. C1 has the smallest angular extent for its dark hole, but maintains reasonably high throughput. C2 has a constant and very low throughput, while C3 has the highest throughput over its entire operating region. Finally, while C1 and C3 cover the full field of view with their dark holes, C2 only creates high-contrast regions in 1/3 of the field of view, thus requiring three integrations to cover the full field.