My favourite exponent of the lat spread is Ekaterina Karaban, and she was only a figure competitor with NABBA, but she hit the pose harder than anyone I've ever seen. This clip on YouTube gives you some idea, but the pic quality is not that great.
I've got an old video at a slightly earlier contest when she is even bigger and does it better. I think it was the NABBA universe of the same year or the previous year.
I may or may not be the only one that likes this, but I love it when a woman's chest/pecs expands when doing a front flat spread. It's not common as you have to have very developed chest muscles to pull it off. To this day, Christine Pomponio remains my favorite woman to do it.