Wow! I shouldn't be surprised but I am to see how close they look in a few photos in particular. As an owner of a Y-Z I can tell you people ask if it is "canary" all the time. They probably wouldn't believe what the real color is. In fact when I go to a particular jewelry store to look at their yellows, the people there ask if mine is FY or FLY. That makes me laugh. Every one fo them is shocked when I say Y-Z.
I'm a huge fan of the color myself. It's not even a subtle yellow, but a very defined yellow that is perfect. I have strangers stop me to tell me how gorgeous and yellow the stone is. I met a lovely lady while out playing with my son who stopped mid conversation to tell me how gorgeous and yellow it was. Though that one made me laugh because she had sunglasses on and took them off because she was shocked to see such yellow even through the shades.
All that makes me smile

There is a very visible difference in the second photo, but the other three are much closer! I'd definitely go for a Y-Z colored diamond any day if given the choice. I find them to be a great value!