A link to where the image is found would be helpful. Are you talking about what size/resolution image? Which browser? How the image appears on the screen would, of course, be computer-specific. I'm not understanding how you can compare browser images, except by trying different browsers on the same computer.
FWIW, when magnified, [going left to right] the first image has higher resolution, the second image appears to about a half step behind, and the third shows distinctly more pixellation. At the magnification shown in your post, differences in the images is difficult to see. Even when magnified, these differences became apparent only after careful examination.