Good example picture of full white antenna. Even the thin antenna part has some white in it. For me this pictures was jaw dropping too when I saw it for the first time. Something to aim for, was my response too . There might be some editing done, but it's seems not be over exposed because you can still see the lines between different segments.
Taking pictures of shrimp is still challenging for me too. You can always argue about them. A shrimp looks different below a big flashlight than a little aquarium tank light. Different color temperatures etc. So I always tell people not to go after a pictures but see them in real life. Sometimes I send people a low light/quality picture to give them a better impression.
Also I truly believe that the shrimp adept to their light source. A lot of bright light seems to have a positive influence on the shrimp color and thickness.
Even top class photographers images can be a source of discussion. The pictures of Ellen Wang shrimp taken by Chris Lukhaup. Just amazing, the red looks so bright and nice. But I can tell you, I've seen them a couple of times in real life on shrimp shows and the red is 'just like' the red of other shrimp, nothing different if you ask me.
But not only the colors, also the details of course on a macro pictures are different. So try to separate them. (Macro) photo's are amazing to look at and show us the beauty of shrimp at a particular moment in time and with a particular light source. In real life you enjoy their appearances, behavior and development over time. I hope you understand what I'm trying to say .
BTW, about MK-breed, I also found this picture. A very bright (this images is indeed over exposed) snow white. Maybe this genes has to do something with it. Not golden, but true snow white. Maybe from a Crystal Black string by selecting.