I think one or two macs used this video interface...

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Nah, no Macs ever used it, but some Apple displays did - the Apple Portrait Display and the Macintosh 21" Colour Display, from memory. However, not only did they use a cable went to a DB-15 connector on the Mac's end, but also, if I'm correct, I think Apple 13W3 is slightly different to Sun 13W3.

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The NeXt computer also used the 13W3 connector but it was proprietary. Sun also used this interface for a while. I have 2 20" Sun monitors with 13W3 connectors. The 13W3 "standard" really wasn't a standard at all. Different vendors were free to assign different signals to the pins so mixing and matching of monitors from different vendors frequently didn't work as the signals coming from the computer might not be on the pin that the monitor expects.