This study builds upon our previous work, where we analyzed the range of real-world colors and identified images containing colors that exceed the boundaries of legacy color gamuts such as sRGB and DCI-P3, making them difficult for traditional displays to render accurately. In our current research, we conducted a series of visual experiments to evaluate perceptual differences and viewer preferences when such images are displayed on ultra-WCG displays compared to standard-gamut displays. Our findings indicate that observers could consistently distinguish between images shown on an ultra-WCG display and the same images calibrated to sRGB. The perceptual difference between DCI-P3 and ultra-WCG was notably smaller, resulting in lower detection rates that were more contentdependent. Overall, observers showed a strong preference for the ultra-WCG display, regardless of the viewing condition or the image content.