Anyone know of HUGE flowering maudiae type?

[Discus]

I saw a "The Queen" not so long ago, and it didn't seem that massive (no more so than my pretty random maudiae plants, which certainly aren't "adult hand sized") which are probably Onyx (a daft name for a green and white flower), but I'm not sure whether to trust that ID (they weren't labelled when sold, so I asked the vendor for a more accurate ID).
The shape of The Queen was quite good though, it must be said.