The WWE figures are closer to 7" scale. I know Daniel took some comparison pics when the line started, I'll see if I can find them.
EDIT: If Daniel took some I couldn't find them. I know one of the review sites took photos with all of Mattel's "six inch" scale figures when the line started but I'm not sure which one if not here... Anyway, I did find a photo thread at the Fwoosh, there are a few comparison pics on this page... http://www.thefwoosh.com/forum/viewtopi ... 2&start=60
From the looks of it Mysterio is probably the closest in scale to DCUC...
I remember looking at Luke Gallows (pretty sure it was before wave 16 of DCUC was announced) and thinking he was the perfect size for Bane.