<p>In all honesty, all three cameras will perform wonderfully for web-sized viewing, which is normally no more than ~5MP, though it's increasing to ~8MP now that Ultra HD is getting more popular. When downsampled in programs like Lightroom, most flaws should disappear and, assuming you apply output sharpening (can be done automatically in Lightroom), the images will be sharp and not "smeary" at all.<br>
Do you plan on setting the camera to save Raw files and then process them in a Raw converter, or do you want to use out of camera JPEG files? Go to Imaging Resource (or any other website that has downloadable sample images) and download some images at the file format you choose, then scale them down for the web and see which one you like best.</p>