I don't have the S100 to compare but I can say that my XZ-1 screen is tough to see in bright sunlight. I've added a Delkin 3" Pop-up shade which helps alot in those bright situations. Kinda like having an 'el-cheapo' VF. I popped the plastic screen protector lens out of the e-Shade before installing to maintain the sharp quality of the excellent XZ-1 display. I keep the shade off most of the time and store it in a pocket of my camera pouch, but can quickly pop it on if it's needed.