I checked my non-IS Canon 8x32WP, 7.5°, and it has some slight pincushioning. Like Henry wrote, just enough to keep panning behaviour nice and civilized. And it has a very flat field, just like the IS-models.
I also checked a few of my other flat-field models and they all have a small amount of pincushion distortion. Way less than the old super wide models but of course they have smaller FoVs anyway.
That sounds like an excellent model to have next to an EL 8x32 to help elucidate the root cause of complex distortion. Especially if an internal schematic was found.
I do already notice several potentially relevant differences on spec sheet, including weight, FOV, ocular lens diameter, eye relief. Pushing these features while also correcting optical aberrations can't be easy.